Gwenna, Eyes of Gaea
From The Brothers' War set
Gwenna, Eyes of Gaea
Legendary Creature — Elf Druid Scout
2/3
: Add two mana in any combination of colors. Spend this mana only to cast creature spells or activate abilities of creature sources.
Whenever you cast a creature spell with power 5 or greater, put a +1/+1 counter on Gwenna and untap it.