When Desolate Lands enters and whenever you cast a spell, it deals 3 damage to target opponent unless they sacrifice a permanent.

Flying
Amity — Whenever you attack with Earthbreaker Dragon and exactly one other creature, Earthbreaker Dragon deals 1 damage to each of up to two target creatures without flying.

Trample, haste
Landfall — When a land you control enters, target creature can't block this turn.
At the beginning of your end step, return Generator Alpha or a land you control to its owner's hand.

{T}: Lavaborn Slug deals 1 damage to target player.
Landfall — Whenever a land you control enters, untap Lavaborn Slug.

Haste
Landfall — Whenever a land you control enters, Leaping Hatchling gains flying and trample until end of turn.

Flying, lifelink, haste
This creature can't block.
When this creature enters, if it was cast, create a red and white Subroutine enchantment token named OVERFLOW with “Whenever this Subroutine runs, return a card named Offset Daemon from your graveyard to the battlefield.”

Landfall — Whenever a land you control enters, Pitfall Pincher deals 1 damage to any target. If that target is a creature, it blocks this turn if able.

Haste
Amity — Whenever you attack with Stitches and exactly one other creature, create a 2/2 Toy artifact creature token with defender, then tap all Toys you control. They're attacking.
At the beginning of your end step, if you didn't create a Toy this turn, transform Stitches.

Trample
Amity — Whenever you attack with Stitches, Orphaned and exactly one other creature, transform Stitches at the beginning of the next turn's upkeep.

Flying, haste
Amity — Whenever you attack with Warden of Heart and exactly one other creature, you may put a legendary or Dragon card from your hand onto the battlefield tapped and attacking.

This spell can't be countered.
Trample
Surface {3}{U}{U}. Wrecking Whale surfaces tapped.