Commander Rendmaw, Creaking Nest Menace, reach When Rendmaw enters and whenever you play a card with two or more card types, each player creates a tapped 2/2 black Bird creature token with flying
Nonetheless, the more cards that get added to Arena, the better
For seven mana, you can bring back a creature exiled this way, under your control, with two +1/+1 counters
The previous Cats printed had heavy affiliation with Equipment, so Nazahn, Revered Bladesmith would push that way
Even if they manage to get a load of stuff back you are still good to go, your things will have haste, will be able to provide some mana and should be able to outright kill their whole board before attacking