Add {W}{U}{B}{R}.

When Dryad of the Keen-Eyed enters, search your library for a basic Forest card, reveal it, and put it into your hand. If your devotion to green is three or greater, put it onto the battlefield tapped instead.

Vigilance
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, put a +1/+1 counter on Encampment Sentinel.

{2}{G}: Endangered Scinok gets +1/+1 until end of turn. This ability costs {1} less to activate until end of turn.

When Energizing Static enters, target creature gets +3/+3 until end of turn. If that creature is an Elemental, it also gains trample until end of turn.

Put a +1/+1 counter on target creature you control. It gains hexproof until end of turn.

{G}, Sacrifice Entangled Fossil: Target card in your graveyard gains surface until end of turn. The surface cost is equal to its mana cost.
Surface {4}{G}{G}. Entangled Fossil surfaces transformed.

Enchant land
Enchanted land has “{T}: Add {G}{G}.”

Target creature gets +X/+X until end of turn. It must be blocked each combat this turn if able.

Enchant creature with another Aura attached to it
Enchanted creature gets +3/+3 and has trample, vigilance, and reach.

When Everpresent Rot enters, create a 1/1 green Saproling creature token, surveil 1, then you gain 1 life.
When one or more permanent cards leave your graveyard, return Everpresent Rot to its owner's hand.

Deathtouch
Other Gorgons, Snakes, and Basilisks you control get +1/+1.
Whenever a creature with deathtouch you control deals combat damage to a player or planeswalker, create a Treasure token.

Reveal the top four cards of your library. Put up to two permanent cards from among them into your hand and the rest into your graveyard. You may put land cards onto the battlefield tapped rather than your hand.
Flashback—{3}{G}, Tap an untapped Ruin you control.

Enchant creature
When Fable of Tooth and Fur enters, create three 2/2 green Wolf creature tokens.
Enchanted creature gets +1/+1 for each creature you control and gains trample.

Enchant creature
Enchanted creature gets +1/+1 and has vigilance and trample.

Enchant land
Enchanted land has “{T}: Add one mana of any color.”

Choose one or both —
• Target Kraken, Leviathan, Octopus, or Serpent creature you control gets +2/+1 until end of turn.
• Target creature you control fights target creature you don't control.

Deathtouch
{1}{W}, {T}: Create a Berry token.
{2}{B}, Sacrifice a Berry: Put a +1/+1 counter on Foraging Grub.

Create three Berry tokens, then sacrifice any number of Berries. For each Berry sacrificed this way, creatures you control get +1/+1 until end of turn.

{VP}{VP}{VP}: Put a +1/+1 counter on Frequency Omnivore.

Search your library for a basic land card, put it onto the battlefield, then shuffle.

{VP}{VP}{VP}: Genre Blender gets +3/+3 until end of turn. Activate only once each turn.

Vigilance
Approval — {1}{G}: Target creature gets +X/+X until end of turn, where X is the number of colors among permanents you control. Activate only once each turn and only as a sorcery.

If you have more life than your starting life total, this spell costs {X} less to cast, where X is equal to the difference.
Trample
When Glacier Guardian enters, you may have it fight target creature you don't control.