The prohibitively high mana value is the only thing holding back Overwhelming Forces, but even then it can be well worth building up to
Each box of this product comes with a bonus pack
If Conduit of Storms attacks and you transform it into Conduit of Emrakul later in combat, youll add R to your mana pool, not CC and not CCR
Furthermore, its attack does nearly unlimited damage because players can discard any amount of energy to deal 50 damage for each energy discarded from their hand
I also hated playing those decks myself, even though I did for a while
Urshifu's upper limit is 180, and while Gardevoir has no damage cap, it cannot consistently hit numbers much higher than 150 without burning too many resources, and Wailord and Metagross are even able to survive those more costly hits as well (Metagross with the help of Metal Goggles)