为 Gwenna, Eyes of Gaea 寻找最佳的争锋套牌，包括其胜率、热度，以及该牌在万智牌：竞技场中的合法赛制！
: 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.
