Tainted Sigil

The clever part is the word "total." Most lifegain pays you back for the damage you personally took, scaling to your own beating; this counts every point of life every player has lost this turn, then hands the whole sum to you. In a multiplayer game where a brutal combat step, a flurry of burn, or a slugfest between two rival players has drained life totals across the table, the payout balloons far past anything a single lifelink swing could manage. The tension built into it is patience versus greed: hold the artifact through a turn where the table bleeds out, and the sacrifice rewards a hoarder. Fire it early and you have spent three mana on a marginal gain. The parenthetical reminder that damage causes loss of life is doing real work, folding burn, attackers, and shock-style payments into the same counter, so the card cares not about who dealt the damage but about how much pain accumulated before you crack it. (Note what it does not count: a Wrath that destroys creatures inflicts no life loss at all, so a board wipe leaves the meter untouched.) It is a vault of every wound the turn has actually drawn blood for, and the design asks you to wait for the bill to come due before you collect.