It can also pay 1GW to give another attacking Cat a power/toughness boost, along with trample
(It's an artifact with ", Sacrifice this token: Add one mana of any color.") 10.0/10$0.40 Deadly Dispute Instant As an additional cost to cast this spell, sacrifice an artifact or creature
The Greatest Fool in the Multiverse The answer is Dack Fayden
Outside of ghoulish overkill, it can always attack and pump the team for +2/+2 and trample, which isnt the most exciting floor, but you only need to gain two or three life before attacks for this to feel overwhelming
Most auras that simply say enchant creature can target your own or an opponent's creature
With Thornbite Staff and mass tap effects like Sleep, you can tap and untap Royal Assassin until all other creatures are in the graveyard