Black Knight [Alpha Edition] Cat Avatar or it will not come

or it will not come

Set: Commander 2017 Type: Sorcery Rarity: Rare Cost: {4}{R}{R} Choose a creature type

Set: Beta Edition Type: Enchantment Rarity: Uncommon Cost: {3}{W} Untapped creatures you control get +0/+2

When Arena of the Ancients enters the battlefield

Black Knight [Alpha Edition] Cat Avatar or it will not comeSet: Alpha Edition Type: Creature Human Knight Rarity: Uncommon Cost: {B}{B} First strike (This creature deals combat damage before creatures without first strike.) Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.) Battle doesn't need a purpose; the battle is its own purpose. You don't ask why a plague spreads or a field burns. Don't ask why I fight.