Xirath, Avatar of Tithes

Whenever you activate an ability that isn't a mana ability, you get a tithe counter. Then, each opponent may pay life equal to the mana spent to activate that ability. For each player who does, you and that player may copy that ability. Players may choose new targets for their copies.

If you have five or more growth counters, activated abilities you control cost {4} less to activate.

If you have ten or more growth counters, whenever you activate an ability that isn't a mana ability, copy that abil