Assert Authority [Mirrodin]

Assert Authority [Mirrodin]Set: Mirrodin Type: Instant Rarity: Uncommon Cost: {5}{U}{U} Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

(This cost is paid as attackers are declared

Set: March of the Machine Commander Type: Enchantment — Aura Rarity: Uncommon Cost: {2}{G} Enchant land

Set: Wilds of Eldraine Type: Creature — Satyr Warrior Rarity: Rare Cost: {3}{G}{G}{G} Trample

Set: Secret Lair Drop Series Type: Enchantment Rarity: Rare Cost: {1}{B}{B} At the beginning of each player's upkeep

Set: Mystery Booster Type: Creature — Goblin Warrior Rarity: Rare Cost: {1}{R} Protection from blue (This creature can't be blocked

Set: Throne of Eldraine Promos Type: Land Rarity: Rare Castle Ardenvale enters the battlefield tapped unless you control a Plains

When Bloodhunter Bat enters the battlefield

Set: Mystery Booster Type: Creature — Goblin Rarity: Common Cost: {R} Haste

choose A through M or N through Z

When the Invasion Tree reached the Underworld

Exile Hanged Executioner: Exile target creature

Set: Mystery Booster Type: Instant Rarity: Common Cost: {2}{U} Target creature gets -4/-0 until end of turn