mtg cards you can have any number of Rules Text: block, any, number, of, creatures, 21 This is of the C rarity. o:"a deck can have any

This might be for small abilities or else sacrificing a creature to then reanimate it for a large ETB ability a la Avenger of Zendikar or Craterhoof Behemoth

You can even get nice results with excess mana from Cabal Coffers or Nykthos, Shrine to Nyx

Since you get these effects only three times each turn, you will want to make sure you have a few was to make creatures at instant speed

There you'd be able to store unneeded items with the big bird due to item storage limitations caused by the NES and Super NES (in the case of FFIV), providing a powerful ally in the process

and proliferate

sits in between It'll Quench Ya