Aiteres, Shadow Heart

Flash
Trample, Lifelink
Upon doing damage to an opponent tap that many lands, they do not untap on their next untap phase, if they do not have that many mana untapped discard the remainder.
If this card is removed from the field for any reason it goes straight to the graveyard. For {b}{b}{b}{b}{b} it can be summoned from the graveyard on player phase only.