You may choose not to untap Giant Oyster during your untap step. {T}: For as long as Giant Oyster remains tapped, target tapped creature doesn't untap during its controller's untap step, and at the beginning of each of your draw steps, put a -1/-1 counter on that creature. When Giant Oyster leaves the battlefield or becomes untapped, remove all -1/-1 counters from the creature.

Flying Historic spells you cast cost {1} less to cast. (Artifacts, legendaries, and Sagas are historic.)

Whenever an opponent casts a spell, you may exchange control of Perplexing Chimera and that spell. If you do, you may choose new targets for the spell. (If the spell becomes a permanent, you control that permanent.)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.) You may choose not to untap Sand Squid during your untap step. {T}: Tap target creature. That creature doesn't untap during its controller's untap step for as long as Sand Squid remains tapped.

No more than one creature can attack each combat. No more than one creature can block each combat.

Flash Flying Spells you cast with mana value 5 or greater cost {1} less to cast and can't be countered.

You may have Wall of Stolen Identity enter the battlefield as a copy of any creature on the battlefield, except it's a Wall in addition to its other types and has defender. When you do, tap the copied creature and it doesn't untap during its controller's untap step for as long as you control Wall of Stolen Identity.

Flying As long as Wonder is in your graveyard and you control an Island, creatures you control have flying.

Draw cards equal to the number of cards in target opponent's hand. Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Draw cards equal to the highest mana value among historic permanents you control. (Artifacts, legendaries, and Sagas are historic.)

Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card. {4}{U}: Tap target creature without flying.

When Archaeomancer enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.) Target player takes an extra turn after this one. Return up to one target nonland permanent to its owner's hand. Exile Karn's Temporal Sundering.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Take an extra turn after this one. Exile Temporal Trespass.

For each attacking creature, its owner puts it on the top or bottom of their library.

Counter target spell.

Exile X target creatures. For each creature exiled this way, its controller creates a 2/2 green Boar creature token.

Return to their owners' hands all creatures with toughness less than or equal to the number of Islands you control.

Tap target creature an opponent controls and put three stun counters on it. Scry 2. (If a permanent with a stun counter would become untapped, remove one from it instead.)

{1}, {T}: Tap target creature. This ability costs {1} less to activate during your turn. {3}, Sacrifice Hylda's Crown of Winter: Draw a card for each tapped creature your opponents control.

Return all nonblue creatures to their owners' hands.

Target player returns each commander they control from the battlefield to the command zone. Draw a card.

Flash When Misleading Signpost enters the battlefield during the declare attackers step, you may reselect which player or permanent target attacking creature is attacking. (It can't attack its controller or their permanents.) {T}: Add {U}.

Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.

Destroy target creature. It can't be regenerated. Its controller creates a 3/3 green Ape creature token.

Destroy target creature. It can't be regenerated. That creature's controller creates a 3/3 green Frog Lizard creature token.

This spell can't be copied. Choose one. If an opponent has eight or more cards in their graveyard, you may choose both. • Copy target spell. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.) • Create a token that's a copy of target creature.

When Soul-Guide Lantern enters the battlefield, exile target card from a graveyard. {T}, Sacrifice Soul-Guide Lantern: Exile each opponent's graveyard. {1}, {T}, Sacrifice Soul-Guide Lantern: Draw a card.

Counter target spell. Create X Treasure tokens, where X is that spell's mana value. (They're artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.")

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Exchange control of target noncreature spell and target creature. Then the spell's controller may choose new targets for it.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I, II — Tap target creature an opponent controls. It doesn't untap during its controller's untap step for as long as you control Time of Ice. III — Return all tapped creatures to their owners' hands.

Return all permanents of the color of your choice to their owners' hands.

Enchant creature Enchanted creature has flying. Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.) When a creature with mana value 6 or greater enters the battlefield, you may return Dragon Wings from your graveyard to the battlefield attached to that creature.

{T}: Add {C}. {T}: Each player gains control of all creatures they own.

({T}: Add {U}.)

{T}: Add {U}. Channel — {3}{U}, Discard Otawara, Soaring City: Return target artifact, creature, enchantment, or planeswalker to its owner's hand. This ability costs {1} less to activate for each legendary creature you control.

You have no maximum hand size. {T}: Add {C}.

{T}: Add {C}. {2}, {T}, Sacrifice a Desert: Exile all graveyards.

As Caged Sun enters the battlefield, choose a color. Creatures you control of the chosen color get +1/+1. Whenever a land's ability causes you to add one or more mana of the chosen color, add one additional mana of that color.

{2}{U}, {T}, Discard a card, Sacrifice a land: Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.) Everflowing Chalice enters the battlefield with a charge counter on it for each time it was kicked. {T}: Add {C} for each charge counter on Everflowing Chalice.

{T}: Add {C}{C}. {2}, {T}, Sacrifice Hedron Archive: Draw two cards.

Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.

{T}: Add {C}{C}.

Blue spells you cast cost {1} less to cast.

Sky Diamond enters the battlefield tapped. {T}: Add {U}.

{T}: Add {C}{C}.

When Solemn Simulacrum enters the battlefield, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle. When Solemn Simulacrum dies, you may draw a card.

{T}: Add {C}{C}{C}.

Equipped creature gets +3/+3 and has protection from each color that's not in your commander's color identity. Equip commander {3} Equip {5}

Equipped creature gets +2/+2 and has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Whenever Grafted Exoskeleton becomes unattached from a permanent, sacrifice that permanent. Equip {2}

Equipped creature gets +3/+2. Whenever a legendary creature enters the battlefield under your control, you may attach Hero's Blade to it. Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)

If equipped creature would deal combat damage, it deals double that damage instead. If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead. Equip {2}

Equipped creature gets +3/+0 and has trample and lifelink. Equip {3}

O-Naginata can be attached only to a creature with power 3 or greater. Equipped creature gets +3/+0 and has trample. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Search your library for an artifact card, reveal it, put it into your hand, then shuffle.