Spore Frog

Sacrifice this creature: Prevent all combat damage that would be dealt this turn.

Crystacean

Flash (You may cast this spell any time you could cast an instant.)

Unhallowed Phalanx

Muldrotha, the Gravetide

During each of your turns, you may play a land and cast a permanent spell of each permanent type from your graveyard. (If a card has multiple permanent types, choose one as you play it.)

Charix, the Raging Isle

Spells your opponents cast that target Charix cost {2} more to cast.
{3}: Charix gets +X/-X until end of turn, where X is the number of Islands you control.

Ruin Crab

Landfall — Whenever a land you control enters, each opponent mills three cards. (To mill a card, a player puts the top card of their library into their graveyard.)

Tower Defense

Creatures you control get +0/+5 and gain reach until end of turn.

Catapult Captain

{2}{B}, {T}, Sacrifice another creature: Target opponent loses life equal to the sacrificed creature's toughness.

Catapult Fodder

At the beginning of combat on your turn, if you control three or more creatures that each have toughness greater than their power, transform this creature.

Catapult Fodder // Catapult Captain

Tree of Perdition

Defender
{T}: Exchange target opponent's life total with this creature's toughness.

Tree of Redemption

Defender
{T}: Exchange your life total with this creature's toughness.

Hedron Crab

Landfall — Whenever a land you control enters, target player mills three cards. (They put the top three cards of their library into their graveyard.)