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Monster Gate
Tribute 1 monster; excavate cards from the top of your Deck until you excavate a monster that can be Normal Summoned/Set. Special Summon it, also send the other excavated cards to the GY.

Monster Reborn
Target 1 monster in either GY; Special Summon it.

Monster Recovery
Target 1 monster you control that is owned by you; if that monster is still on the field, shuffle it and your entire hand into the Deck, also, after that, draw cards equal to the number of cards you shuffled from your hand into the Deck by this effect. (You cannot activate this card if you have a card in your hand that is owned by your opponent.)

Monster Reincarnation
Discard 1 card, then target 1 monster in your GY; add it to your hand.

Morale Boost
Each time a player equips an Equip Spell Card, increase the Life Points of the controller of that Equip Spell Card by 1000 points. Each time an Equip Spell Card is removed from the field, the controller of that Equip Spell Card takes 1000 points of damage.

Morinphen
A strange fiend with long arms and razor-sharp talons.

Morphing Jar
FLIP: Both players discard as many cards as possible from their hands, then each player draws 5 cards.

Morphing Jar #2
FLIP: Shuffle all monsters on the field into the Deck. Then, each player excavates cards from the top of their Deck, until they excavate the same number of monsters they shuffled into their Main Deck. Special Summon all excavated Level 4 or lower monsters in face-down Defense Position, also send the remaining cards to the Graveyard.

Mother Grizzly
When this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 WATER monster with 1500 or less ATK from your Deck, in face-up Attack Position.

Mountain
All Dragon, Winged Beast, and Thunder monsters on the field gain 200 ATK/DEF.