Cast Murderous Redcap by paying ({2} magic symbol) ({BR} magic symbol) ({BR} magic symbol) , which enters with a +1/+1 counter on it due to Rhythm of the Wild.
When Murderous Redcap enters the battlefield, it triggers, dealing an amount of damage to itself equal to its power.
Murderous Redcap dies as a state-based action due to having 0 toughness.
Murderous Redcap's persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Rhythm of the Wild.