Biden, Locus of Dementia

When Biden, Locus of Dementia enters
the battlefield, target opponent discards a card.
Landfall — Whenever a land enters the
battlefield under your control, target opponent
loses 4 life if this is the first time this ability has resolved this turn. If it's the second time, add {r}{g}{b}{u}. If it's the third time, Biden
deals 4 damage to each creature and each planeswalker you don't control.