Muddle the Mixture

Counter target instant or sorcery spell.
Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Counterspell

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Ashnod's Altar

Etherium Sculptor

Artifact spells you cast cost {1} less to cast.

Myr Retriever

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

Pierce Strider

When Pierce Strider enters, target opponent loses 3 life.

Impact Tremors

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.

Workshop Assistant

When Workshop Assistant dies, return another target artifact card from your graveyard to your hand.