Homarid Spawning Bed

{1}{U}{U}, Sacrifice a blue creature: Create X 1/1 blue Camarid creature tokens, where X is the sacrificed creature's mana value.

Thought Vessel

You have no maximum hand size.
{T}: Add {C}.

Barrin, Master Wizard

{2}, Sacrifice a permanent: Return target creature to its owner's hand.

Abjure

As an additional cost to cast this spell, sacrifice a blue permanent.
Counter target spell.

Aether Barrier

Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay {1}.

A Little Chat

Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell.)
Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Alchemist's Apprentice

Sacrifice Alchemist's Apprentice: Draw a card.

Inga Rune-Eyes

When Inga Rune-Eyes enters, scry 3.
When Inga Rune-Eyes dies, draw three cards if three or more creatures died this turn.