Tezzeret the Seeker [Duel Decks: Elspeth vs. Tezzeret] Standard Size Set: 30th Anniversary Promos Type:

Set: 30th Anniversary Promos Type: Artifact Rarity: Rare Cost: {2} {T}: Add one mana of any color in your commander's color identity

and you just made the wrong one

convert Starscream

such as the Warehouse that can store resource tokens or the Scribe that grants players an immediate bonus turn

Martial Powers & Races Deck that includes spell-like racial abilities

Tezzeret the Seeker [Duel Decks: Elspeth vs. Tezzeret] Standard Size Set: 30th Anniversary Promos Type:Set: Duel Decks: Elspeth vs. Tezzeret Type: Legendary Planeswalker Tezzeret Rarity: Mythic Cost: {3}{U}{U} +1: Untap up to two target artifacts. X: Search your library for an artifact card with converted mana cost X or less and put it onto the battlefield. Then shuffle your library. 5: Artifacts you control become artifact creatures with base power and toughness 5 5 until end of turn.