Ironroot Burnwillow

Conjure {g}(When this permanent enters play, you
may pay {g} to exile target creature card in a
graveyard with a converted mana cost 1 to put 1
+1/+1 counter on target creature or gain 1 life.)
{t}: Add {g}.
Whenever a player gains 3 or more life or 3 or
more +1/+1 counters are put on any number of creatures in a turn, you may add {r/w} at
the start of your next turn's main phase.