Search your library for a green creature card with converted mana cost X or less and put it onto the battlefield, then shuffle your library. Shuffle Green Sun's Zenith into its owner's library.

Whenever you cast a creature spell this turn, draw a card.

, Pay 1 life, Sacrifice Verdant Catacombs: Search your library for a Swamp or Forest card and put it onto the battlefield. Then shuffle your library.

Return an Elf you control to its owner's hand: Untap target creature. Activate this ability only once each turn.

Nettle Sentinel doesn't untap during your untap step.
Whenever you cast a green spell, you may untap Nettle Sentinel.

When Elvish Visionary enters the battlefield, draw a card.

: Add to your mana pool.

Tap three untapped Elves you control: Add to your mana pool.

: Add to your mana pool for each Elf on the battlefield.

Tap two untapped Elves you control: Add one mana of any color to your mana pool.
Morph

: Add to your mana pool for each creature you control.

Return a Forest you control to its owner's hand: Untap target creature. Activate this ability only once each turn.

As Temple Garden enters the battlefield, you may pay 2 life. If you don't, Temple Garden enters the battlefield tapped.

Changeling
: Creatures you control become X/X and gain all creature types until end of turn.

: Add to your mana pool.

As Cavern of Souls enters the battlefield, choose a creature type.
: Add to your mana pool.
: Add one mana of any color to your mana pool. Spend this mana only to cast a creature spell of the chosen type and that spell can't be countered.

, Pay 1 life, Sacrifice Misty Rainforest: Search your library for a Forest or Island card and put it onto the battlefield. Then shuffle your library.

When Regal Force enters the battlefield, draw a card for each green creature you control.

As an additional cost to cast Crop Rotation, sacrifice a land.
Search your library for a land card and put that card onto the battlefield. Then shuffle your library.

(Dryad Arbor isn't a spell and it's affected by summoning sickness.)
Dryad Arbor is green.

When Viridian Shaman enters the battlefield, destroy target artifact.

Islands don't untap during their controllers' untap steps.

As Steely Resolve enters the battlefield, choose a creature type.
Creatures of the chosen type have shroud.

Living Weapon
Equipped creature gets +0/+1 and has "Sacrifice this creature: This creature deals 1 damage to target creature or player."
Equip

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Noncreature spells cost more to cast.

Enchant player
If a card would be put into enchanted player's graveyard from anywhere, instead that card is revealed and put on the bottom of that player's library.