Kallere, Heretic Prophet

Eminence -- Whenever another Cleric enters the battlefield under your control, if Kallere, Heretic Prophet is in the command zone or on
the battlefield, you may pay twice X life. If you do, target creature gets -X/-X until end of turn.
When you cast Kallere, Heretic Prophet, gain control of target nonlegendary creature with toughness less than or equal to the amount of life you lost this turn for as long as you control Kallere.