Keeping them off of their commander, stifling an important activation or making them whiff on a trigger are all ways to stop combos that end the game in their tracks
Making spells cost more to cast is a powerful and disruptive ability, but at six mana it's just not going to work the way it needs to
(To mill four cards, put the top four cards of your library into your graveyard.) Artist Francisco Badilla Set OM1 - Through the Omenpaths Number 164 Language English printings (0) view Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pauper, Pioneer, Standard, Timeless, Vintage
This left a significant but seemingly irrelevant imbalance in the colours