When Burning-Tree Emissary enters the battlefield, add {R}{G}.

Convoke When Knight-Errant of Eos enters the battlefield, look at the top six cards of your library. You may reveal up to two creature cards with mana value X or less from among them, where X is the number of creatures that convoked Knight-Errant of Eos. Put the revealed cards into your hand, then shuffle.

Flying

Surge {1}{R} (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.) Haste When Reckless Bushwhacker enters the battlefield, if its surge cost was paid, other creatures you control get +1/+0 and gain haste until end of turn.

Flash When Resolute Reinforcements enters the battlefield, create a 1/1 white Soldier creature token.

When Thraben Inspector enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) When Venerated Loxodon enters the battlefield, put a +1/+1 counter on each creature that convoked it.

{T}: Add {C}. {T}: Add {R} or {W}. Battlefield Forge deals 1 damage to you.

Castle Embereth enters the battlefield tapped unless you control a Mountain. {T}: Add {R}. {1}{R}{R}, {T}: Creatures you control get +1/+0 until end of turn.

If you control two or more other lands, Den of the Bugbear enters the battlefield tapped. {T}: Add {R}. {3}{R}: Until end of turn, Den of the Bugbear becomes a 3/2 red Goblin creature with "Whenever this creature attacks, create a 1/1 red Goblin creature token that's tapped and attacking." It's still a land.

Inspiring Vantage enters the battlefield tapped unless you control two or fewer other lands. {T}: Add {R} or {W}.

{T}, Pay 1 life: Add one mana of any color.

({T}: Add {R}.)

Create a 1/1 red Dinosaur creature token with haste and a 1/1 white Human Soldier creature token.

When Forge Devil enters the battlefield, it deals 1 damage to target creature and 1 damage to you.

Choose one — • You gain 4 life. • Destroy target enchantment. • Put a +1/+1 counter on target creature.

Creatures without flying can't block this turn.

This spell can't be countered. Rending Volley deals 4 damage to target white or blue creature.

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.