Mythos of Vadrok |
Sorcery (R)
~ deals 5 damage divided as you choose among any number of target creature and/or planeswalkers. If was spent to cast this spell, until your next turn, those permanents can't attack or block and their activated abilities can't be activated.

Kill a bunch of stuff and/or lock down their board. Not bad for four mana.

So WU is not an alternate casting cost? You would basically need to spend two mountain and a plains and an island to reap the full benefit?

Yes. It is not an alternate it's an "If the generic you paid included these"

I feel like this one doesn't get much of a bump from its . Late game, you can ping and clear five blockers but typically you want to kill what you hit