Mystic Skull // Mystic MonstrosityHow it works & interactions with other cards

A Dual-Purpose Artifact

On its front face, Mystic Skull acts as a mana filter. By paying one generic mana and tapping it, you can produce one mana of any color. This is particularly useful in multi-colored decks where you might be missing a specific land type. Later in the game, you can spend five mana and tap it to transform it into Mystic Monstrosity, which grants all your lands the ability to tap for any color of mana without needing to filter first.

Transforming the Skull

The transformation is an activated ability that costs five mana. This ability can be activated at any time you could cast an instant, provided the artifact is untapped. Once the ability resolves, you flip the card over. Unlike some other double-faced cards, it stays on the battlefield during this process; it does not leave and return. If it was an artifact on the front, it becomes an Artifact Creature on the back.

Combat and Summoning Sickness

A common mistake involves attacking or tapping for mana immediately after transforming. Because Mystic Monstrosity is a creature, it is subject to summoning sickness. If you haven't controlled the permanent continuously since the beginning of your most recent turn, you cannot tap it for mana or attack with it. However, the lands it affects do not become creatures, so they can still be tapped normally.

Interaction examples

Accelerating the Setup

Foundry Inspector

With Foundry Inspector on the battlefield, the cost to cast Mystic Skull is reduced by one generic mana, allowing you to play it for just {1}. This allows you to start filtering your mana for colors you lack much earlier in the game.

Color Fixing Overload

Ornithopter of Paradise

If you have both Mystic Skull and Ornithopter of Paradise, you have two different sources of any-color mana. You can tap the Ornithopter to produce the {1} needed to activate Mystic Skull's filtering ability, effectively turning one colorless mana from a land into any color you need while still having the Ornithopter's own mana available.

The Monstrosity's Domain

Once you have successfully transformed the card into Mystic Monstrosity, all lands you control gain a new tap ability. This doesn't replace their original abilities; instead, it gives you the option to tap a basic Mountain for Blue mana or a utility land that usually only produces colorless mana for any color of your choice.