AeroVeedramon

“[When Digivolving] If you don't have a [Trial of the Four Great Dragons] in play, place 1 [Trial of the Four Great Dragons] from your hand in your battle area. <br>[Opponent's Turn] While you have a Digimon with [Four Great Dragons] in its traits in play, or [Trial of the Four Great Dragons] is in your battle area, this Digimon gains [Blocker].”