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You can only use this effect of "Gnomaterial" once per turn

Ratio: Run 1-2 An interesting take from the classic Marshmallon is that this new monster ensures your other monsters are protected from attacks, and it can surprise the opponent trying to finish you off by summoning from your hand during your opponents turn if you control Shining Sarcophagus

The trinities are the co-forbidden pair of Fairy Tail - Snow and Cir, Malebranche of the Burning Abyss, then 2 additional copies of Tour Guide From the Underworld, 2 additional copies of Mathematician, and 1 additional copy of Dante, Traveler of the Burning Abyss

Some decks tend to make usage of this fact, especially those running Geartown but note that you need to set your Field Spell to have Geartown not miss his timing

If this card is Ritual Summoned: You can return up to 3 monsters your opponent controls to the hand, then you can Special Summon 1 Level 4 or lower Spirit monster from your hand, ignoring its Summoning conditions

If this card is Special Summoned: You can Special Summon 1 "Altergeist" monster from your Deck in Defense Position, except "Altergeist Multifaker"