one piece card game crocodile (OP02-053) Paramount War Card Number Crocodile

Jace, the Perfected Mind Jace, the Perfected Mind is one of my favorite mill planeswalkers

The persist does a reasonable job of negating the discard cost, as does having things like the Bloodghast

D&D Plane Shift D&D also got a series of free online supplements (small booklets of info and rules covering a specific setting) for Zendikar, Innistrad, Kaladesh, Amonkhet, Ixalan, and Dominaria along with the three sourcebooks

Any as [this creature] enters or [this creature] enters with abilities of the copied creature will also work

Elves are ideal

Rofellos, Llanowar Emissary ( Urza's Destiny ) Weatherlight Saga, we tried hard to get as many Magic iconic creatures into the story as we could