This can be used to delay opponents, prevent permanents from being destroyed, or even blink them for additional ETB effects
In general, youll probably want this as a Thassas Bounty, but the second mode means that every now and then you can win the game out of nowhere
The amount of mana it generates, combined with being a win condition on its own, is just massive for a Modern card
Longer term this card has a lot of potential if any low-cost Merlins are released especially in Sapphire, Steel, or Ruby
You can use it on an opposing Commander which is legendary to half its power and toughness to double the turns needed to kill you with Commander Damage due to the legendary rule one copy would die
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