Frost Lynx

{t}Add {x} {u} mana to your mana pool with {x} being the amount of life
your opponent lost in your previous turn
When Frost Lynx enters the battlefield, tap target creature an opponent controls. That
card doesn't untap in your opponents next untap
stage
And all this time I thought we were tracking it!
-Ikoria, Leader of the Abbadon cult