Zahr Gada, Expedition Leader

Swampwalk, Islandwalk
Whenever this creature deals combat damage to a player, add that much mana in any combination
of colors that lands you opponents control could produce. Until end of turn, you don't lose this
mana as steps and phases end.
Whenever you cast a spell using mana produced
by Zahr Gada, each opponent loses 1 life and you
gain that much life.