Murkfiend Liege

Other green creatures you control get +1/+1.
Other blue creatures you control get +1/+1.
Untap all green and/or blue creatures you control during each other player's untap step.

Wistful Selkie

When Wistful Selkie enters the battlefield, draw a card.

Slippery Bogle

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Groundling Pouncer

{G/U}: Groundling Pouncer gets +1/+3 and gains flying until end of turn. Activate only once each turn and only if an opponent controls a creature with flying.

Island

Clout of the Dominus

Enchant creature
As long as enchanted creature is blue, it gets +1/+1 and has shroud. (It can't be the target of spells or abilities.)
As long as enchanted creature is red, it gets +1/+1 and has haste.

Stream Hopper

{U/R}: Stream Hopper gains flying until end of turn.

Favor of the Overbeing

Enchant creature
As long as enchanted creature is green, it gets +1/+1 and has vigilance.
As long as enchanted creature is blue, it gets +1/+1 and has flying.

Sturdy Hatchling

Sturdy Hatchling enters the battlefield with four -1/-1 counters on it.
{G/U}: Sturdy Hatchling gains shroud until end of turn. (It can't be the target of spells or abilities.)
Whenever you cast a green spell, remove a -1/-1 counter from Sturdy Hatchling.
Whenever you cast a blue spell, remove a -1/-1 counter from Sturdy Hatchling.

Forest

Flooded Grove

{T}: Add {C}.
{G/U}, {T}: Add {G}{G}, {G}{U}, or {U}{U}.

Monstrify

Target creature gets +4/+4 until end of turn.
Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)