Katsu, the Wanderer // Quicken (WTR076 // WTR225) (WTR)

Katsu, the Wanderer
Once per Turn Effect - When an attack action card you control hits, you may discard a card with cost 0. If you do, search your deck for a card with combo, banish it face up, then shuffle your deck. You may play it this turn.

Quicken
(Aura's stay in the arena until they are destroyed.)
When you play an attack action card or attack with a weapon, destroy Quicken and the attack gains go again.