Mountain

Havoc Devils

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Lathliss, Dragon Queen

Flying
Whenever another nontoken Dragon you control enters, create a 5/5 red Dragon creature token with flying.
{1}{R}: Dragons you control get +1/+0 until end of turn.

Onakke Ogre

Spit Flame

Spit Flame deals 4 damage to target creature.
Whenever a Dragon you control enters, you may pay {R}. If you do, return Spit Flame from your graveyard to your hand.

Sparktongue Dragon

Flying
When Sparktongue Dragon enters, you may pay {2}{R}. When you do, it deals 3 damage to any target.

Kargan Dragonrider

As long as you control a Dragon, this creature has flying.

Volcanic Dragon

Fiery Finish

Fiery Finish deals 7 damage to target creature.

Sure Strike

Target creature gets +3/+0 and gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Burning Sun's Avatar

When Burning Sun's Avatar enters, it deals 3 damage to target opponent or planeswalker and 3 damage to up to one target creature.

Demanding Dragon

Flying
When Demanding Dragon enters, it deals 5 damage to target opponent unless that player sacrifices a creature of their choice.

Charging Monstrosaur

Shock

Meteor Golem

When this creature enters, destroy target nonland permanent an opponent controls.

Viashino Pyromancer

When this creature enters, it deals 2 damage to target player or planeswalker.

Goblin Instigator

When Goblin Instigator enters, create a 1/1 red Goblin creature token.

Pyromantic Pilgrim

Haste (This creature can attack and {T} as soon as it comes under your control.)