and now for a separate, non-rules post:
funny story though: I found this combo where you use High Tide and the Urza's era "untap X lands" blue spells to generate ridiculous amounts of mana. turns out that was already a deck (three, actually) in Legacy. so now I play Legacy too, Spring Tide combo to be specific. it sucks, but it's fun as hell to play, and it will nearly always win anywhere between turns 2-4 depending on whether I draw or play, and my hand. assuming the opponent doesn't have any counters... which is a big assumption to make