Esper #49
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$5.45
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Card Details
Artifact spells cost 
less to cast.
Whenever chaos ensues, creatures you control that are white, blue, and/or black become artifacts in addition to their other types until end of turn. Then each artifact creature you control gains vigilance, menace, and lifelink until end of turn.
Illustrated by Bruce Brenneise
Rulings (6)
Apr 14, 2023
Esper's first ability doesn't change the mana cost or mana value of any artifact spell. It changes only the total cost players pay.
Apr 14, 2023
If a spell you cast has 
in its mana cost, you choose the value of X before calculating the spell's total cost. For example, if an artifact spell's mana cost is , you could choose 2 as the value of X and pay 
to cast the spell.
Apr 14, 2023
If there are additional costs to cast an artifact spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions.
Apr 14, 2023
That ability can't reduce the amount of colored mana players pay for a spell. It reduces only the generic component of that cost.
Apr 14, 2023
The cost reduction can apply to alternative costs such as prototype costs.
Apr 14, 2023
The set of artifact creatures affected by the chaos ability is determined as that ability resolves. Artifact creatures you begin to control later in the turn and permanents that become artifact creatures later in the turn won't get the bonuses.