Aggravating Acorn

Haste

At the beginning of your end step, return this creature to its owner's hand. (Return it only if it's
on the battlefield.)

At the beginning of your upkeep, if you've played cards named Aggravating Acorn this game a number of times divisible by five that hasn't previously triggered this ability, you may search your library for a card named Acorn Maker. If you do, put it into your hand, then shuffler your library.