That makes her singlehandedly one of the best creatures for any board state
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The design trick to bleeding effects like these is to make a cycle
There aren't many of these kinds of creatures, but you should definitely have a few in your deck and thankfully, they're all fairly affordable
That will make Kitt a 5/5 trampler, and is in the color of haste in red, so you can drop her, make two 1/s with a token doubler, have haste with something like Fires of Yavimaya, tap the tokens to pump her to a 5/5, and smash for 5 Commander Damage out of nowhere
Arcbound Ravager, originally from Mirrodin , certainly qualifies, as it was one of the main elements of the dominant artifact decks from the era, which relied on the eminently broken artifact lands and Disciple of the Vault combined with the Ravager for quick wins