Snow-Covered Forest

Manabarbs

Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.

Swamp

Forest

Saskia the Unyielding

Vigilance, haste
As Saskia enters, choose a player.
Whenever a creature you control deals combat damage to a player, it deals that much damage to the chosen player.

Snow-Covered Swamp

Plains

Snow-Covered Mountain

Mountain

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}.