Ward {3}
Whenever Horror of the Mystic Sea attacks, defending player mills two cards. If they milled two nonland cards this way, Horror of the Mystic Sea can't be blocked this turn.

Ward—Sacrifice a permanent.
Whenever Host of the Neverending Revel enters or attacks, each player sacrifices a nonland, nontoken permanent. For each player who doesn't, you draw a card.

When Hostage Situation enters, target opponent reveals their hand. Exile a nonland card from it and up to one creature card from your graveyard. When Hostage Situation is no longer on the battlefield, return the exiled cards to their owner's hands.

Put a hexproof counter on target creature you control. At the beginning of the next end step, remove a counter from that creature.

Trample
When Hunger's Door enters, you may return target Aura card from your graveyard to the battlefield attached to Hunger's Door.

When Hungry Blob enters, destroy up to three target artifacts and/or enchantments with total mana value 3 or less.

Flying
When Hungry Songbird enters, create a Berry token.

Target creature has base power and toughness 1/1 and loses all abilities until your next turn.
Draw a card.

Favored
Whenever Iara, Blessed-Hart attacks, Iara and another target attacking creature gain double strike until end of turn.

{VP}{VP}{VP}: Reveal the top seven cards of your library. You may have Iconic Hologram become a copy of a legendary creature card revealed this way until end of turn. Put the revealed cards on the bottom of your library in a random order.

Trample
When Idealistic Voter enters, make a pledge.

{X}, {T}, Sacrifice another creature: Create a token that's a copy of target nontoken creature you control other than Identity Forger with mana value X.

Creatures you control that have been a target or the source of a spell or ability you controlled this turn have ward {2}.
Once each turn, when you spend mana to activate an ability, you may gain that much life.
{X}{U}{R}{W}: Idolized Coordinator and another target creature you control each get +X/+X and gain vigilance until end of turn.

Exile the top card of your library. You may play that card this turn.
Flashback {R}

Ignite deals damage to any target equal to your devotion to red.

Menace
Whenever Ignited Soul deals combat damage to a player, you may discard a card. If you do, draw a card.

Amity — This spell costs {1} less to cast if you attacked with exactly two creatures this turn.
Draw two cards.

Opponents can't cast more than one spell each turn.
[+1]: Create a 3/1 white Knight creature token with “As long as it's your turn, this creature has indestructible.”
[–X]: Return a permanent card with mana value X from your graveyard to the battlefield.
[–4]: If you controlled a creature as you activated this ability, you may destroy all creatures. You may do the same for artifacts and enchantments.

Enchant land
Enchanted land is a 4/4 Dryad creature with reach, vigilance, and haste. It's still a land.
When enchanted land dies, return it to its owner's hand.

This spell costs {1} less to cast if there is a card named Avert Disaster or Imminent Disaster in your graveyard.
Exile target creature or planeswalker.

Trample
When Imperfect Fugisaur enters, you may sacrifice an artifact. If you do, it gains haste until end of turn.
Whenever Imperfect Fugisaur deals combat damage to a player, that player sacrifices an artifact. If they can't, you draw a card.

Whenever Implacable Shrine-Guard attacks, for each color, do the following if your devotion to that color is three or greater.
{W} — Create a 1/1 white Human creature token.
{U} — Draw a card.
{B} — Each opponent loses 2 life.
{R} — Create a Treasure token.
{G} — You gain 3 life.

Create three 1/1 colorless Cyborg artifact creature tokens, then you gain 1 life for each artifact you control. Each opponent loses that much life.

Menace
Whenever Imposing Maw deals combat damage to a player, that player loses 3 life unless they discard a card.

Imposing Oddity enters with X +1/+1 counters on it.
Whenever Imposing Oddity becomes spellcharged, put a +1/+1 counter on it.
Spellcharge 4
When Imposing Oddity dies, you may put its counters on another target Ruin you control.