Link's comments about his own card, Altar of Appeasement, lead me to think of this. He noted that the card is sort of funny, because it's great in an aggro deck, but when the opponent lets you have it, it suddenly doesn't look too crazy, since it just fixes your mana.

This card, however... I could see a player just accepting 5 life for the first 5 turns of the game trying to deny you from accelerating in their face. Since I'm clearly ripping a page straight from Link's book, it didn't seem fair to put it in my own set. It can hang out here for a while.

Hee. Yep, fun, for the same kind of reasons as Altar of Appeasement.

I'm sure this must be broken somehow, but ETBT and only producing colourless stops most abuses.

If you have an Amulet of Vigor in multiplayer, you could make a deal with someone to pay 15 life to give you 15 mana if you promise not to attack them with whatever Eldrazi you play. But that's a bit hard to set up.

Actually, heck, even if nobody makes a deal, I could see people playing a two-card artifact combo that gives you Channel. Especially on turn 1. That allows Artificer's Intuition or Trinket Mage to search up either half. Erm... yeah, this would see play in Modern.

EDIT: Wait, "any opponent". Huh, I managed to completely misread that. Never mind then.

Both this and the Altar are interesting cards. I can see a control player sitting back and denying you mana development backed by their counterspells OR sitting there behind their counters using this or the Altar as incidental damage as a backup plan.