Myr Retriever

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

Dispel

Etherium Sculptor

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

Workshop Assistant

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

Impact Tremors

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

Ashnod's Altar

Brainstorm

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

Counterspell

Pierce Strider

When Pierce Strider enters, target opponent loses 3 life.

Island

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.)