为 红宝石收集者 寻找最佳的标准套牌，包括其胜率、热度，以及该牌在万智牌：竞技场中的合法赛制！
When you attack with three or more creatures, conjure a card named Mox Ruby into your hand. This ability triggers only once.
: Creatures you control get +1/+0 until end of turn.
