Rhonas the Indomitable
Oracle Text
Deathtouch, indestructible
Rhonas the Indomitable can't attack or block unless you control another creature with power 4 or greater.
: Another target creature gets +2/+0 and gains trample until end of turn.
Card Rulings
4/18/2017 Once Rhonas has attacked or blocked, it will remain in combat even if you no longer control another creature with power 4 or greater.
4/18/2017 You don’t have to attack with another creature with power 4 or greater for Rhonas to be able to attack. The same is true of blocking.
Also, just like Oketra, i am putting this in my Anafenza edh if i have 2, one in Temur, one in Abzan.
Standard also quite good, although not many cheap creatures to enable it. Probably best with some sort of vehicle build.