WhiteOut costs 8 green AP on Iceman until you use Build a Snowman, then it costs 12 as long as the tile is on the board.
Neither ability says anything about this.
Who do you have him teamed up with? Who are you fighting? Is it possible there’s a passive power out there that’s causing this?
I tried with a team of Iceman, Vulture, and Ant-Man on the 4* node of today's Deadpool's Daily, against Blade, Nick Fury, and Ares, and experienced this ability cost variation.
Didn't it previously cost 12AP and got reduced to 8AP during a rebalance, or did I imagine that? Perhaps that is causing the old power cost to kick in?