Weve seen a couple in the past, like Mythos of Illuna and Will of the Temur, but overall, its an incredibly rare effect
Cards Realm has a virtual booster opening simulator for Unknown Event with realistic, rarity-weighted pulls
Emerald is a somewhat underutilized ink in competitive play, but thats not to say that it is underpowered
It takes a few turns for this elemental fish to get going, though cards like Goldberry, River-Daughter and Aquitect's Will help speed things along
Base case, everyone loses 5 and you gain 15 when it dies, and it's a 5/5 for 5, which is also great stats
Those two cards are not only great getting your creatures tapped, they also give you something powerful to do with all those extra creature tokens, as you can use those Enchantments to start tapping down your opponents stuff, and things can snowball from there