Mobilize

Untapping your whole board for a single green mana sounds explosive until you notice what is missing from the line of text: any reason to do it at a profit. There is no combat trick stapled on, no extra-combat aggression engine to feed, no convoke or tap-based payoff that the untap is paying into. The card assumes a board state and a follow-up that its original product never supplied, because the starter set it debuted in was not building toward combos; it was teaching turn structure to new players, in language plain enough to read once and understand. That history is the whole story here: a clean, cheap, repeatable-looking effect that has never found the deck willing to pay a card for it. Its theoretical home is anywhere creatures tap for value and then need to swing or block again, but the rate (one card, one mana, all upside spent in a single moment) keeps it permanently a step behind whatever piece would actually exploit it. The interesting thing is the gap. The untap is the easy half of a two-card idea; the payoff is the half nobody printed alongside it, so a board-wide effect that should feel busted instead reads as a curio: combat math waiting for infrastructure its own design language was never going to provide.