@Matsumoto: Uh, casting a spell and having it resolving are two separate things. Isolation Cell triggers when the spell is cast, I.E. when the mana is paid and the spell is put on the stack, which causes Isolation Cell's trigger to be put onto the stack above the spell. Isolation Cell resolves, causing the player who cast the creature spell to lose 2 life unless they pay 2. Now, after Isolation Cell resolves (in which case Tsunaki's opponent would've been at 1 life), it is still completely possible to counter said Creature Spell, as it is still on the stack and therefore still vulnerable to counterspells. Psychic Barrier would've killed him, and technically you would've won Tsunaki. Congrats, by the way, that's a clever use of a fun combination of cards.

As for the card itself, hilarious in any bleeder deck, and in the Mono-White Phyrexian control I've been working on, really makes it hard for the opponent to gain any ground. Combine it with Chancellor... (see all)