Pact of Negation [Masters 25] Kaladesh Inventions where X is the mana

where X is the mana value of a commander you own on the battlefield or in the command zone

and has "Whenever a player casts a spell or a creature attacks

Set: Zendikar Rising Type: Creature — Elemental Rarity: Mythic Cost: {4}{G}{G} Reach

put that many vitality counters on Living Artifact

{T}: Put target Aura card from a graveyard onto the battlefield under your control attached to a creature you control

Pact of Negation [Masters 25] Kaladesh Inventions where X is the manaSet: Masters 25 Type: Instant Rarity: Rare Cost: {0} Counter target spell. At the beginning of your next upkeep, pay {3}{U}{U}. If you don't, you lose the game. Those who expect betrayal at every turn are seldom disappointed.