Omnath, Locus of All

If you would lose unspent mana, that mana becomes black instead.
At the beginning of your first main phase, look at the top card of your library. You may reveal that card if it has three or more colored mana symbols in its mana cost. If you do, add three mana in any combination of its colors and put it into your hand. If you don't reveal it, put it into your hand.

Yurlok of Scorch Thrash

Vigilance
A player losing unspent mana causes that player to lose that much life.
{1}, {T}: Each player adds {B}{R}{G}.

Piracy

Until end of turn, you may tap lands you don't control for mana. Spend this mana only to cast spells.

Upwelling

Players don't lose unspent mana as steps and phases end.

Select decks to compare

Deck A:

Deck B: