WotC Gatherer wrote:
Until end of turn, whenever a player taps an Island for mana, that player adds Blue to his or her mana pool (in addition to the mana the land produces).
Emphasis mine. That's the important bit. High Tide creates a trigger that only works when an island is actually tapped for mana.
Vataro wrote:
Since you tapped the island for mana before the instant was played, it would not produce a second mana and you would have 10 at your disposal.
QFT. :)
Vataro wrote:
Good luck getting all of those in your hand at the same time =P.
Not that hard, scarily enough. Since High Tides is so old (as far as I can tell, it hasn't been reprinted since Fallen Empires), I assume that CestinShaman is either playing this deck in a Legacy format of some sort, or isn't playing it in any official events. Either way, he'll have access to the blue old-school card drawing and library manipulation (Fact or Fiction, Brainstorm, Ancestral Recall, etc.).
Blue decks specialize in finding stuff in their libraries. I've seen old-school combo and control decks that ran single copies of their win conditions, because the decks were just so efficient at finding it that running more than one copy was a waste of deck slots.
Kirby wrote:
Man, I miss playing MTG at the card shop after school.
Ditto. I haven't played in years. My sister's roommates started playing a few months ago, but they're all too busy to play too often, and my schedule these days doesn't allow me to play in any tournaments at the local game store (and I can't really spare the money either). :)