Proliferate effects make it easy to exploit its counters, and it functions as a discard outlet
Arena will cap the tokens at 250, otherwise we would run into a board state where every instance of token production would create more tokens than there are particles in the universe
Its abilities care about casting cards from zones that arent your hand, and adventures fit nicely in that space
Locke from Final Fantasy VI One of the main characters in FFVI gets his long-overdue spotlight via two cards: a Legendary Creature card that captures his charming thief qualities (cannot be blocked by stronger enemies, Treasure-generating from milled lands) and a red Instant that gives you resources
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The final Separation effect, even though it's only on the opponent's turn, is ready to run away from removal and deploy again