Rhonas the Indomitable

Deathtouch, indestructible
Rhonas can't attack or block unless you control another creature with power 4 or greater.
{2}{G}: Another target creature gets +2/+0 and gains trample until end of turn.

Jumpstart 2022

Deathtouch, indestructible
Rhonas the Indomitable can't attack or block unless you control another creature with power 4 or greater.
{2}{G}: Another target creature gets +2/+0 and gains trample until end of turn.

Amonkhet Remastered

Amonkhet

Amonkhet Invocations

Amonkhet Promos

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.