Mana Flare [Foreign Black Border] Mirrodin Besieged Tokens you may put a -1/-1

you may put a -1/-1 counter on target creature

Set: Gatecrash Type: Creature — Human Warrior Rarity: Common Cost: {1}{G} {R}: Disciple of the Old Ways gains first strike until end of turn

if Opal Acrolith is an enchantment

Set: Duelist Pack: Rivals of the Pharaoh Card type: Normal Trap Rarity: Common When an opponent's monster that was Tribute Summoned declares an attack: Destroy as many face-up Attack Position monsters they control as possible

Set: Crossed Souls Card type: Normal Trap Rarity: Secret Rare Target 5 cards in your Graveyard

Mana Flare [Foreign Black Border] Mirrodin Besieged Tokens you may put a -1/-1Set: Foreign Black Border Type: Enchantment Rarity: Rare Cost: {2}{R} Whenever a player taps a land for mana, that player adds one mana of any type that land produced.