Team Tech's Wave Go!
■ (This spell is put into your mana zone tapped.)
Shield trigger (When this spell is put into your hand from your shield zone, you may cast it immediately for no cost.)
■ Choose one of the following.
► Return all your opponent's cards that cost 5 or less in the battle zone to their owner's hand.
► Destroy one of your opponent's creatures that costs 6 or more.
It's just an amazing card for Team Tech standards which usually gets bad cards. Plus it's literally a ramp troll's wet dream.