AssimilateThis mechanic was designed specifically for the creature type ooze. Immediately after coming up with it I realized that it was extremely similar to the mechanic devour from Shards of Alara, and may be too similar to exist. I liked the idea of an ooze that swallows up things to grow stronger. I also think that it is high time that wizards creates an entire set where ooze is a tribe, cause they are just awesome.
Example CardsAgile Ooze 2R
Creature - Ooze
Assimilate - When Agile Ooze enters the battlefield, sacrifice a creature you control and put X +1/+1 counters where X is that creatures toughness.
This reminds me a lot of the Devour mechanic, which Wizards has since described as non-intuitive. Your version is a little cleaner, but I'm not sure how exciting it is.
Creature - Dragon 2/2, 2RG (4)
Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)
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