Reoccuring Thoughts

Imprint — , : You may exile an instant or sorcery card with mana value X from your hand. At the beginning of your upkeep, you may copy a card exiled with this artifact. If you do, you may cast the copy without paying its mana cost.

Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand. , : You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.

Mill seven cards. At the beginning of the next end step, exile seven cards from your graveyard.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle. Threshold — If there are seven or more cards in your graveyard, instead search your library for up to three basic land cards, put them onto the battlefield tapped, then shuffle.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) Indestructible (Damage and effects that say "destroy" don't destroy this creature.) If Darksteel Colossus would be put into a graveyard from anywhere, reveal Darksteel Colossus and shuffle it into its owner's library instead.