Ghalta, Primal Hunger is an old beefy beater, and similar to Phyrexian Dreadnaught he can come out for very little mana, but this guy can technically stay around, and only costs GG if you have a few bodies out
The most well-known pairing that handles multiple aspects of this combo is Yawgmoth, Thran Physician, where Geralfs Messenger regularly finds a home
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The negation effect it carries around is strong, but conditional: " Once per turn, when your opponent activates a card or effect that targets exactly 1 WATER monster you control (and no other cards) (Quick Effect): You can negate the activation, and if you do, destroy that card
If you ever see a combo piece magically end up in a green players Graveyard, expect to see it snaking its way onto the Battlefield within the next turn or two