Gift of Growth

In Commander, Gift of Growth earns its slot in go-tall decks that want instant-speed pump to threaten commander damage kills out of nowhere — untapping the creature is the detail that separates it from simpler pump spells, since it lets you attack, pump to lethal, and still hold up a blocker. In Pauper, the common slot is crowded with pump options, and Gift of Growth competes with spells that grant trample or evasion rather than raw stat-doubling, which limits its appeal in a format full of chump-blockers. Modern and Legacy have little use for a sorcery-speed-equivalent pump spell that doesn't advance a combo; Gift of Growth is too slow and too narrow for those formats' threat density. Oathbreaker mirrors Commander in its creature-centric games, so the same go-tall commanders that want it there want it here too.