Shriekmaw

four generic mana one black mana Creature — ElementalPower and toughness3/2

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

When this creature enters, destroy target nonartifact, nonblack creature.

Evoke one generic mana one black mana (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

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0.42 $

Foil 5.89 $

81 printings · up to 0.78 $

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Shriekmaw rulings

2021-03-19
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an evoke cost), add any cost increases, then apply any cost reductions. The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
2021-03-19
If you pay the evoke cost, you can have Shriekmaw's own triggered ability resolve before the evoke triggered ability. You can cast spells after that ability resolves but before you have to sacrifice Shriekmaw.

Shriekmaw keyword rules

Evoke Rule 702.74

Evoke represents two abilities: a static ability that functions in any zone from which the card with evoke can be cast and a triggered ability that functions on the battlefield. “Evoke [cost]” means “You may cast this card by paying [cost] rather than paying its mana cost” and “When this permanent enters, if its evoke cost was paid, its controller sacrifices it.” Casting a spell for its evoke cost follows the rules for paying alternative costs in rules and –h.