Legendary Creature — God
Deathtouch, indestructible
Rhonas 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.
5/5
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Once Rhonas has attacked or blocked, it will remain in combat even if you no longer control another creature with power 4 or greater.
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.