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Hes also one of the cheapest ways to add a real clock to a control shell a 2/2 that can chip away at life totals every single turn while your other spells do double duty

There's an excellent data analysis post by u/IamMandrell on reddit, analyzing trophy decks (that's to say, only looking at decks that reached 7 wins)

Cards like Unruly Catapult, Galvanic Juggernaut, Traxos, Scourge of Kroog, Staff of Compleation, Bender's Waterskin, and the game changer, Mana Vault all have ways to untap themselves

Later in the game, the impact of this card is reduced a bit, since just one mana probably won't make that big of a difference on turn fifteen or more, but the explosive early game it can provide is impossible to ignore

cards/sleeves with exclusive designs, encouraging multiple purchases to collect them all