mtg lemur card Momo, Friendly Flier Viscid Lemures - Time Spiral:

While it costs four mana to cast normally, you can drop it down to just one red mana if you have a creature out with power four or more

It leads to very long and unfun combo turns and is extremely strong with staples like Paradox Engine An incredibly easy combo and mana-generation card, with all the artifact mana played in Commander

Because they are cost-effective to produce, they are the best format for testing new game mechanics before committing to holographic foil printing

Equipped creatures you control gain indestructible until end of turn

With the mana curve in this deck, thats almost any spell

Even if it never attacks, you can make a bunch of zombies from milling yourself or anyone else