mtg online card database Magic: The Gathering Then and Now, Part 1

Sign in Blood Sign in Blood stands out for its low mana value and dual nature: it's both a threat and a resource

It enters with a flying counter on it if a card discarded this way has flying

Aura Shards Potentially the most obnoxious choice on the list, virtually any deck benefits from Aura Shards

Gaddock Teeg If you asked me to define a hatebear, Id show you a picture of Gaddock Teeg: a cheap creature that looks your opponent in the eye and tells them no. A frequent flyer in the sideboards of creature-toolbox decks, this hobb-er, kithkin, works incredibly well in Commander since it tells most decks not to do the thing they were built to do: play big, splashy spells

As for the Steel and Emerald deck, this is one for more experienced players

Faclier, Agent Provacateur, you can use Hades, Lord of the Underworld to retrieve it from your discard and play it again