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PCubwarden
Cubwarden
Creature — CatPIKOrare
Mutate 
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Lifelink
Whenever this creature mutates, create two 1/1 white Cat creature tokens with lifelink.
3/5
Prices
TCGPlayer$0.93TCGPlayerfoil$0.47
Card Kingdom$1.79
Card Kingdomfoil$1.49
Cardmarket€0.42Cardmarketfoil€0.35Cardsphere$1.14
Rulings2
2013-07-01If you change the creature type of a Sliver you control so it’s no longer a Sliver, it will no longer be affected by its own ability. Its ability will continue to affect other Sliver creatures you control.
2013-07-01Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like flying, having more than one instance of the ability doesn’t provide any additional benefit.