Unclaimed Territory

As Unclaimed Territory enters, choose a creature type.
{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type.

Construct

This creature gets +1/+1 for each artifact you control.

Dinosaur

Ancient Den

Clue

{2}, Sacrifice this artifact: Draw a card.

Gnome Soldier

This creature's power and toughness are each equal to the number of artifacts and/or creatures you control.

{1}, {T}, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)