Spellbook of Life [REDU-EN059] Super Rare 65a you can send 1 monster

you can send 1 monster from your hand to the Graveyard to take control of 1 face-up monster your opponent controls with the same Level as the sent monster

and if you do

where X is its toughness minus 1

In that case you'll get a nice view before it knocks the tree down and eats you

While "Necrovalley" is on the field

Spellbook of Life [REDU-EN059] Super Rare 65a you can send 1 monsterSet: Return of the Duelist Card type: Spell Card Rarity: Super Rare Banish 1 Spellcaster Type monster from your Graveyard and reveal 1 other "Spellbook" Spell Card in your hand to target 1 Spellcaster Type monster in your Graveyard; Special Summon that target in face up Attack Position and equip it with this card. The equipped monster's Level is increased by the Level of the monster that was banished for this card's activation. You can only activate 1