Fun with Demon(s)

Whenever Karn blocks or becomes blocked, it gets -4/+4 until end of turn. : Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.

Flying, trample Whenever Rakdos attacks, sacrifice half the non-Demon permanents you control, rounded up. Whenever Rakdos deals combat damage to a player, that player sacrifices half the non-Demon permanents they control of their choice, rounded up.

Each land is a Swamp in addition to its other land types.

All Swamps are 1/1 black creatures that are still lands.

Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand. , : You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.

Changeling (This card is every creature type.) Creatures target player controls get +0/+1 and gain all creature types until end of turn.