mtg polymorph cards Morderkainen's X 3 (MTG Single Card) - collectibles - by owner - sale Maybe a little *too* convincing. Fantasy North - Polymorph -

No doubt players will look at this card and their first thoughts will jump to long-time staples such as Relic of Progenitus and Soul-Guide Lantern, both of which can exile entire graveyards while simultaneously giving you the ability to draw a card in the process, replacing what you lose in the transaction

Mutilate is great but requires you to be heavily committed to Black or mono Black

Copying spells like Karn's Temporal Sundering can have a huge effect on the game

Note this has to be cast to work, but with returning it to your hand instead of your battlefield, I like this in artifact recursion to kill, and recur, ideally after copying a Mindslaver or Memory Jar

Each one has its unique perks, so find the one that works best for you depending on how many cards you are shipping at once

March of the Machine mechanics MTG March of the Machine's mechanics introduced a brand new card type, Battles