Warp Strike

Cast Warp Strike only during combat, before attackers are declared.
If Warp Strike was cast during your turn, put a creature from your hand into play tapped and attacking. Sacrifice it at the beginning of your next end step.
If Warp Strike was cast during an opponent's turn, put a creature from your hand into play. It can block any number of creatures this turn, and must block each attacking creature if able. Sacrifice it at the beginning of your next end step.