Mystic Visionary

Threshold — Mystic Visionary has flying as long as seven or more cards are in your graveyard.

Abandoned Outpost

Abandoned Outpost enters tapped.
{T}: Add {W}.
{T}, Sacrifice Abandoned Outpost: Add one mana of any color.

Seafloor Debris

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

Island

Millikin

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

Cephalid Looter

{T}: Target player draws a card, then discards a card.

Aven Windreader

Flying (This creature can't be blocked except by creatures with flying or reach.)
{1}{U}: Target player reveals the top card of their library.

Mystic Crusader

Protection from black and from red
Threshold — As long as seven or more cards are in your graveyard, Mystic Crusader gets +1/+1 and has flying.

Beloved Chaplain

Cephalid Scout

Flying
{2}{U}, Sacrifice a land: Draw a card.

Hallowed Healer

{T}: Prevent the next 2 damage that would be dealt to any target this turn.
Threshold — {T}: Prevent the next 4 damage that would be dealt to any target this turn. Activate only if seven or more cards are in your graveyard.

Plains

Skycloud Egg

{2}, {T}, Sacrifice Skycloud Egg: Add {W}{U}. Draw a card.

Mystic Zealot

Threshold — As long as seven or more cards are in your graveyard, Mystic Zealot gets +1/+1 and has flying.

Syncopate

Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Puppeteer

{U}, {T}: You may tap or untap target creature.

Shelter

Target creature you control gains protection from the color of your choice until end of turn.
Draw a card.

Mystic Penitent

Vigilance
Threshold — As long as seven or more cards are in your graveyard, Mystic Penitent gets +1/+1 and has flying.

Pilgrim of Justice

Protection from red
{W}, Sacrifice Pilgrim of Justice: The next time a red source of your choice would deal damage this turn, prevent that damage.

Second Thoughts

Exile target attacking creature.
Draw a card.

Blessed Orator

Angelic Wall

Defender (This creature can't attack.)
Flying

Think Tank

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Nomad Decoy

{W}, {T}: Tap target creature.
Threshold — {W}{W}, {T}: Tap two target creatures. Activate only if seven or more cards are in your graveyard.

Embolden

Prevent the next 4 damage that would be dealt this turn to any number of targets, divided as you choose.
Flashback {1}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Kirtar's Desire

Enchant creature
Enchanted creature can't attack.
Threshold — Enchanted creature can't block as long as seven or more cards are in your graveyard.