Is Enclave Elite legal in Standard, Modern, and Commander?

Enclave Elite is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Enclave Elite

Q: What type of card is Enclave Elite?

Enclave Elite is a Creature — Merfolk Soldier. Its oracle text reads: "Multikicker {1}{U} (You may pay an additional {1}{U} any number of times as you cast this spell.) Islandwalk (This creature can't be blocked as long as defending player controls an Island.) This creature enters with a +1/+1 counter on it for each time it was kicked. Power/Toughness: 2/2"