Ulvenwald Observer

Emerge 6GGG (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.) When you cast this spell, creatures you control get +2/+2 and gain trample until end of turn. Trample, haste

Flying Sacrifice this creature: Creatures you control gain indestructible until end of turn.

You may cast Aura and Equipment spells as though they had flash. Whenever an Equipment you control enters, you may attach it to target creature you control.

Emerge 5BB (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.) When you cast this spell, target opponent reveals their hand. You choose from it a nonland card with mana value 3 or less and a card with mana value 4 or greater. That player discards those cards.

Flash Emerge 5UU (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.) When you cast this spell, tap up to four target permanents.

This spell costs 1 less to cast for each card type among cards in your graveyard. When you cast this spell, you gain control of target opponent during that player's next turn. After that turn, that player takes an extra turn. Flying, trample, protection from instants

You may cast this card from exile. When this creature becomes the target of a spell or ability an opponent controls, exile this creature.