This spell costs {X} less to cast, where X is the total power of creatures you control. Trample

Whenever you attack, put a shield counter on target attacking creature. Until end of turn, it gains "Whenever this creature deals combat damage to a player, remove a shield counter from it. If you do, draw a card." (If a creature with a shield counter on it would be dealt damage or destroyed, remove a shield counter from it instead.)

{T}: Add {G}.

Creature spells you cast with power 4 or greater cost {2} less to cast. Whenever Goreclaw, Terror of Qal Sisma attacks, each creature you control with power 4 or greater gets +1/+1 and gains trample until end of turn.

{T}: Add one mana of any type that a land you control could produce.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.

Destroy target artifact or enchantment.

When Reclamation Sage enters the battlefield, you may destroy target artifact or enchantment.

As long as Centaur Omenreader is tapped, creature spells you cast cost {2} less to cast.

When Garruk's Uprising enters the battlefield, if you control a creature with power 4 or greater, draw a card. Creatures you control have trample. (They can deal excess combat damage to the player or planeswalker they're attacking.) Whenever a creature with power 4 or greater enters the battlefield under your control, draw a card.

When Ground Seal enters the battlefield, draw a card. Cards in graveyards can't be the targets of spells or abilities.

Destroy target creature with flying.

{T}: Untap target Forest.

Destroy all enchantments.

When Gamekeeper dies, you may exile it. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and put all other cards revealed this way into your graveyard.

{T}: Add {G}.

All creatures able to block Shinen of Life's Roar do so. Channel — {2}{G}{G}, Discard Shinen of Life's Roar: All creatures able to block target creature this turn do so.

Choose target creature you control and target creature you don't control. If you cast this spell during your main phase, the creature you control gets +1/+1 until end of turn. Then those creatures fight each other. (Each deals damage equal to its power to the other.)

As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast.

Spells cost {1} less to cast.

Trample Play with the top card of your library revealed. You may cast creature spells from the top of your library. (Do this only any time you could cast that creature spell. You still pay the spell's costs.)

{T}: Add one mana of any color. Spend this mana only to cast a creature spell.

{T}: Add an amount of {G} equal to your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)

Creature spells you cast with mana value 6 or greater cost {2} less to cast.

Whenever you cast a creature spell, draw a card.

At the beginning of your upkeep, if you control a creature with power 4 or greater, draw a card.

Trample As an additional cost to cast green permanent spells, you may pay 2 life. Those spells cost {G} less to cast if you paid life this way. This effect reduces only the amount of green mana you pay. Whenever you cast a green permanent spell, put a +1/+1 counter on each creature you control.

As an additional cost to cast this spell, sacrifice a creature. Draw cards equal to the sacrificed creature's power.

Hideaway 4 (When this land enters the battlefield, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) Mosswort Bridge enters the battlefield tapped. {T}: Add {G}. {G}, {T}: You may play the exiled card without paying its mana cost if creatures you control have total power 10 or greater.

Destroy target artifact or enchantment. Its controller gains 4 life.

Green creature spells you cast cost {1} less to cast. Whenever you cast a creature spell, target creature you control gets +2/+2 and gains trample until end of turn.

At the beginning of each player's draw step, that player draws an additional card. Each player may play an additional land on each of their turns.

Trample Whenever another nontoken creature enters the battlefield under your control, you may draw a card.