The Unagi of Kyoshi Island and Auntie Ool, Cursewretch use mechanics that debuted with their set like waterbending and blight as ward costs as well
It destroys a creature and replaces it with a 3/3 Ape token, all for one mana to make it easy to cast at any point
Their power varies wildly based on strategy and format, so lets get out the jewelers loupe and take a look at these crystals
Plunge into the artifact-laden plane of Mirrodin in Scars of Mirrodin, where the Phyrexian threat looms large
Unfortunately, given this card's rarity, it seldom sells on TCGPlayer, though it does have a single recent sale in HP, LP, and NM condition, ramping up from $170 to $400 to $500, respectively
Once a replacement effect has been applied to an event, it can't be applied again to the resulting events