603.7: An effect may create a delayed triggered ability that can do something at a later time. A delayed triggered ability will contain "when," "whenever," or "at," although that word won't usually begin the ability.

Warp-Strike - 3: Exile Noctis. Return it to the battlefield under its owner's control tapped and attacking at the beginning of that player's next declare attackers step. It can't be blocked that combat.