Authgrim, Keeper of Naya

{t}: Add {r}{g},{r}{w}, or {g}{w} to your mana pool.
Spend this mana only to cast creature spells.
When a creature with power 4 or greater enters
the battlefield under your control, choose one-
• Gain 2 life.
• Put a +1/+1 counter on target creature.
• Scry 1.
"Come my friends, Naya calls for aid."