Blue Elemental Blast

Choose one —
• Counter target red spell.
• Destroy target red permanent.

Urborg, Tomb of Yawgmoth

Each land is a Swamp in addition to its other land types.

Boil

Stormtide Leviathan

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
All lands are Islands in addition to their other types.
Creatures without flying or islandwalk can't attack.

Sylvan Paradise

One or more target creatures become green until end of turn.

Yavimaya, Cradle of Growth

Each land is a Forest in addition to its other land types.

Trait Doctoring

Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another until end of turn.
Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

Spreading Algae

Enchant Swamp
When enchanted land becomes tapped, destroy it.
When Spreading Algae is put into a graveyard from the battlefield, return Spreading Algae to its owner's hand.

Doom Blade

Painter's Servant

As Painter's Servant enters, choose a color.
All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors.

Red Elemental Blast

Choose one —
• Counter target blue spell.
• Destroy target blue permanent.