At the beginning of combat on your turn, Deepfathom Echo explores. Then you may have it become a copy of another creature you control until end of turn. (To have this creature explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Trample

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Flying Murktide Regent enters the battlefield with a +1/+1 counter on it for each instant and sorcery card exiled with it. Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on Murktide Regent.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Flying Exploit (When this creature enters the battlefield, you may sacrifice a creature.) Whenever another creature you control dies, put a +1/+1 counter on Silumgar Scavenger. It gains haste until end of turn if it exploited that creature.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) If a creature card with flying was exiled with Soulflayer's delve ability, Soulflayer has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance.

Ward {2} Enrage — Whenever Strong is dealt damage, you get three rad counters and put three +1/+1 counters on Strong. You gain life rather than lose life from radiation.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Flying

When Sultai Soothsayer enters the battlefield, look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard.

Landfall — Whenever a land enters the battlefield under your control, you may get two rad counters. {T}: Put target land card in a graveyard that was milled this turn onto the battlefield under your control tapped.

Flying Whenever The Wise Mothman enters the battlefield or attacks, each player gets a rad counter. Whenever one or more nonland cards are milled, put a +1/+1 counter on each of up to X target creatures, where X is the number of nonland cards milled this way.

Flying Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

+2: Draw a card. Each player mills two cards. −5: Put target creature card from a graveyard onto the battlefield under your control. −11: Gain control of all creatures target opponent controls.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Look at the top seven cards of your library. Put two of them into your hand and the rest on the bottom of your library in any order.

You can't spend mana to cast this spell. Convoke, delve (Each creature you tap while casting this spell pays for {1} or one mana of that creature's color. Each card you exile from your graveyard pays for {1}.) You may cast Hogaak, Arisen Necropolis from your graveyard. Trample

Choose a card type, then reveal the top four cards of your library. Put all cards of the chosen type revealed this way into your hand and the rest into your graveyard. (Artifact, creature, enchantment, instant, land, planeswalker, sorcery, and tribal are card types.)

Bog Wreckage enters the battlefield tapped. {T}: Add {B}. {T}, Sacrifice Bog Wreckage: Add one mana of any color.

({T}: Add {G} or {U}.) As Breeding Pool enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

{T}: Add one mana of any color in your commander's color identity.

Darkmoss Bridge enters the battlefield tapped. Indestructible {T}: Add {B} or {G}.

Dimir Guildgate enters the battlefield tapped. {T}: Add {U} or {B}.

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

{T}: Add one mana of any color that a land an opponent controls could produce.

({T}: Add {G}.)

Golgari Guildgate enters the battlefield tapped. {T}: Add {B} or {G}.

({T}: Add {U}.)

Mistvault Bridge enters the battlefield tapped. Indestructible {T}: Add {U} or {B}.

{T}: Add {C}. {1}, {T}: Add one mana of any color in your commander's color identity. If you spend this mana to cast your commander, it enters the battlefield with a number of additional +1/+1 counters on it equal to the number of times it's been cast from the command zone this game.

Opulent Palace enters the battlefield tapped. {T}: Add {B}, {G}, or {U}.

({T}: Add {B} or {G}.) As Overgrown Tomb enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Seafloor Debris enters the battlefield tapped. {T}: Add {U}. {T}, Sacrifice Seafloor Debris: Add one mana of any color.

Simic Guildgate enters the battlefield tapped. {T}: Add {G} or {U}.

({T}: Add {B}.)

Tanglepool Bridge enters the battlefield tapped. Indestructible {T}: Add {G} or {U}.

Thriving Grove enters the battlefield tapped. As Thriving Grove enters the battlefield, choose a color other than green. {T}: Add {G} or one mana of the chosen color.

Thriving Isle enters the battlefield tapped. As Thriving Isle enters the battlefield, choose a color other than blue. {T}: Add {U} or one mana of the chosen color.

Thriving Moor enters the battlefield tapped. As Thriving Moor enters the battlefield, choose a color other than black. {T}: Add {B} or one mana of the chosen color.

Timberland Ruins enters the battlefield tapped. {T}: Add {G}. {T}, Sacrifice Timberland Ruins: Add one mana of any color.

Flying If damage would be dealt to you, prevent that damage and mill twice that many cards.

Trample When Excavation Mole enters the battlefield, mill three cards.

Enchant creature Enchanted creature gets +3/+3. Dredge 2 (If you would draw a card, you may mill two cards instead. If you do, return this card from your graveyard to your hand.)

Reveal the top four cards of your library. Put all land cards revealed this way into your hand and the rest into your graveyard.

Whenever Sidisi, Brood Tyrant enters the battlefield or attacks, mill three cards. Whenever one or more creature cards are put into your graveyard from your library, create a 2/2 black Zombie creature token.

At the beginning of your upkeep, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — Each player mills three cards. II — Exile up to two target cards from graveyards. For each creature card exiled this way, you gain 1 life. III — Return target creature or land card from your graveyard to your hand.

{T}: Add one mana of any color in your commander's color identity. Sacrifice Commander's Sphere: Draw a card.

{T}: Add {U} or {B}. {U}{B}, {T}, Sacrifice Dimir Cluestone: Draw a card.

{T}: Add {U} or {B}. {U}{B}: Dimir Keyrune becomes a 2/2 blue and black Horror artifact creature until end of turn and can't be blocked this turn.

{T}: Add {B} or {G}. {B}{G}, {T}, Sacrifice Golgari Cluestone: Draw a card.

{T}: Add {B} or {G}. {B}{G}: Golgari Keyrune becomes a 2/2 black and green Insect artifact creature with deathtouch until end of turn.

+1: Untap up to one target creature and up to one target land. −2: Reveal the top four cards of your library. You may put a creature card and/or a land card from among them into your hand. Put the rest into your graveyard. −8: You get an emblem with "Whenever a creature enters the battlefield under your control, you may have it fight target creature." Then create three 8/8 blue Octopus creature tokens.

{T}: Add {G} or {U}. {G}{U}, {T}, Sacrifice Simic Cluestone: Draw a card.

{T}: Add {G} or {U}. {G}{U}: Simic Keyrune becomes a 2/3 green and blue Crab artifact creature with hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

{T}: Add {B}, {G}, or {U}. {B}{G}{U}, {T}, Sacrifice Sultai Banner: Draw a card.

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.) Exile a card from your graveyard: Add {C}. Spend this mana only to cast a spell that's one or more colors without {X} in its mana cost.

Lands you control have "{T}: Add one mana of any color." +1: Up to one target land you control becomes a 3/3 Elemental creature with vigilance, hexproof, and haste until your next turn. It's still a land. −2: Mill three cards. You may put a permanent card from among the milled cards into your hand. −7: You get an emblem with "You may play lands and cast permanent spells from your graveyard."

+1: Reveal the top four cards of your library. Put all land cards revealed this way into your hand and the rest into your graveyard. 0: Put any number of land cards from your hand onto the battlefield tapped. −3: Create a green Treefolk creature token with reach and "This creature's power and toughness are each equal to the number of lands you control." −8: Return all permanent cards from your graveyard to your hand. You get an emblem with "You have no maximum hand size."

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Flying Whenever Ethereal Forager attacks, you may return an instant or sorcery card exiled with Ethereal Forager to its owner's hand.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) When Sibsig Muckdraggers enters the battlefield, return target creature card from your graveyard to your hand.

Spells and abilities your opponents control can't cause you to discard cards or sacrifice permanents. +1: Choose a nonland card name, then reveal the top four cards of your library. Put all cards with the chosen name from among them into your hand and the rest into your graveyard. −3: Return target card from your graveyard to your hand.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I, II — Mill two cards, then you may return a creature card from your graveyard to your hand. III — Return all land cards from your graveyard to the battlefield, then shuffle your graveyard into your library.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Target player sacrifices two creatures.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Destroy target nongreen creature. It can't be regenerated.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Counter target spell unless its controller pays {X}.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Destroy target creature.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Flying {X}, {T}, Exile X cards from your graveyard: Target creature gets -X/-X until end of turn.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Return target nonland permanent you control and target nonland permanent you don't control to their owners' hands.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Put target nonland permanent on top of its owner's library.

{3}, {T}: Target player puts the bottom card of their library into their graveyard. If it's a creature card, you create a 2/2 black Zombie creature token.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Create X tapped 2/2 black Zombie creature tokens.