Altar of Dementia [Tempest] Planechase the player can activate mana

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

1 Hero of Bretagard

While doing so

Set: Shards of Alara Type: Artifact Rarity: Common Cost: {2}{B} {T}: Target player loses 1 life

Set: Alpha Edition Type: Enchantment — Aura Rarity: Uncommon Cost: {2}{U} Enchant enchantment

Altar of Dementia [Tempest] Planechase the player can activate manaSet: Tempest Type: Artifact Rarity: Rare Cost: {2} Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power. "It is not that you will go mad. It is that you will beg for madness." Volrath