Ray of Command

The instant-speed theft spell, and the timing is the whole card. Where sorcery-speed steal effects like Threaten ask you to commit during your main phase and swing, this one waits for the opponent's combat step, which turns a temporary borrow into a clean answer. The untap clause is what makes the timing work: you can seize a creature that has already attacked and is sitting tapped, then redeploy it as a fresh blocker during the same combat. The haste rider is not a corner case but load-bearing: any creature that changes controllers has summoning sickness for its new controller, so without haste the borrowed creature could neither attack nor use its tap abilities the turn you grab it. The tap-on-return clause is the quiet sting: when control reverts at end of turn, the creature comes back tapped, leaving its original owner defenseless on the crackback. The unusual part is the color. Theft of this kind usually lives in red, where Threaten and its descendants pay a one-shot cost for a turn of borrowed aggression. Pricing it at instant speed in blue, with the untap and return-tap clauses bolted on, makes it less a haymaker than a control player's reactive tool: a counterspell pointed at combat math rather than at the stack.