Elsewhere Flask
{2}
Artifact
When ~this~ enters, draw a card.
Sacrifice ~this~: Choose a basic land type. Each land you control becomes that type until end of turn.
Giant Slug
{1}{B}
Creature -- Slug
1/1
{5}: At the beginning of your next upkeep, choose a basic land type. ~this~ gains landwalk of the chosen type until the end of that turn. (It can't be blocked as long as defending player controls a land of that type.)
Terraformer
{2}{U}
Creature -- Human Wizard
2/2
{1}: Choose a basic land type. Each land you control becomes that type until end of turn.