Lore Seeker

Whenever Abomination blocks or becomes blocked by a green or white creature, destroy that creature at end of combat.

Cumulative upkeep—Put a -1/-1 counter on Aboroth.

Flying
Whenever Abyssal Specter deals damage to a player, that player discards a card.

Look at target player's hand and choose two cards from it. Put them on top of that player's library in any order.

Haste
You may exert Ahn-Crop Crasher as it attacks. When you do, target creature can't block this turn.

{T}: Add {C}.
{G}{U}, {T}: You may cast spells this turn as though they had flash.

When Alpine Guide enters the battlefield, you may search your library for a Mountain card, put that card onto the battlefield tapped, then shuffle your library.
Alpine Guide attacks each combat if able.
When Alpine Guide leaves the battlefield, sacrifice a Mountain.

As An-Zerrin Ruins enters the battlefield, choose a creature type.
Creatures of the chosen type don't untap during their controllers' untap steps.

Reach
Tap an untapped Spider you control: Search your graveyard and/or library for a card named Arachnus Web and put it onto the battlefield attached to target creature. If you search your library this way, shuffle it.

{3}, {T}: Tap target creature you control and target creature of an opponent's choice they control. Those creatures fight each other.

Unearth {R}
When Ash Akhu is unearthed, it deals 2 damage to any target.

{3}, {T}: Target player looks at the top three cards of their library, puts one of them back on top of their library, then exiles the rest.

Target creature gets +X/+X until end of turn, where X is your devotion to green.

Destroy target silver-bordered permanent in any game you can see from your seat.

Whenever Assembled Alphas blocks or becomes blocked by a creature, Assembled Alphas deals 3 damage to that creature and 3 damage to that creature's controller.

Haste
When Avarax enters the battlefield, you may search your library for a card named Avarax, reveal it, and put it into your hand. If you do, shuffle your library.
{1}{R}: Avarax gets +1/+0 until end of turn.

Hexproof, reach

At the beginning of combat on your turn, you may have target creature get +2/+0 until end of turn.

Whenever a green creature dies, its controller discards a card.

Whenever a Beast becomes blocked, it gets +1/+1 until end of turn for each creature blocking it.

Double strike
Spellbound — {2}{R}, Exile an instant or sorcery card from your graveyard: Another target creature you control gains double strike until end of turn. Activate this ability only any time you could cast a sorcery.

This spell costs {1} less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.

{T}: Add {R}.

Sacrifice another creature: Blood Bairn gets +2/+2 until end of turn.

Bog Rats can't be blocked by Walls.