Whenever a time counter is removed from this card while its exiled, draw a card
Looking at the maths, in a typical Standard deck youre going to need twenty creatures to have over an 80% chance to return one from the four cards Gyruda will mill from your deck when it enters the battlefield
Most collectors grade their cards purely to authenticate and preserve their cards current condition
Ive tried to sneak a few copies of Mutavault into most of my decks recently, but it can be difficult in aggressive or midrange strategies that need multiple colors of mana and are reliant on actually playing spells on-curve
Did you do it with self mill
This can come in the form of incidental damage (Sabotender), threat of activation (i.e., an aggro deck that can use Paladin's Arms to trade up its creatures over time), or snowballing incremental advantages from archetype payoffs