Dante, The Tax Collector

Whenever an opponent casts a spell, searches their library, or activates an ability of a nonland permanent that is not a mana ability, that player loses 1 life and you gain 1 life unless they pay {1}.
Whenever a nonland permanent under an opponent's control leaves play, that player loses 1 life and you gain 1 life unless they pay {1}.
Whenever an opponent pays {1} for Dante's ability, put a +1/+1 counter on Dante.