Ellisence, Mana Weaver

For each point of mana in the activation cost of
any activated ability, that ability's controller may
pay 2 life instead. If a player pays 6 or more life
in this way, they draw a card, then discard a card.
Whenever you cast an instant or sorcery, for each
2 life you pay as part of that spell's casting cost,
or as an additional or alternate cost, it gains your
choice of split second, wither, or lifelink. If you
pay 4 or more life this way, it also gains overload.