Eternal Magic is full of game-breaking artifacts, enchantments, planeswalkers, and lands, but too diverse to justify maindecking narrow answer cards
I really like how well she works alongside a card like Lashwrithe: sacrifice the equipped creature to get a number of 2/2 Zombie tokens equal to the creatures power plus the number of Swamps you control
Well, this card also has a nifty bit of text that says: create a token copy of this card when you cast an instant or sorcery spell. An incredibly strong ability, this card also serves as a creature version of the ever-popular (and massively strong) storm mechanic, which copies spells based on how many spells youve cast before it during the turn
You almost never get to ultimate level, but it's there if you want
When it deals combat damage, you get an extra turn, which is an extremely strong effect