Chain to Memory

In Commander, Chain to Memory earns its slot in decks that care about spell count — Prowess payoffs, Magecraft triggers, or commanders that reward casting cheap instants repeatedly. The tap effect answers an attacker or stops a key blocker without spending a full removal spell, and the scry 1 keeps the engine turning. In Pauper, the combination of interaction and card selection at common rarity makes it a legitimate consideration for blue tempo and control shells. Elsewhere — Modern, Pioneer, Legacy — the competition at two mana is steep enough that Chain to Memory doesn't make the cut outside of fringe spell-synergy strategies.