Bogardan Dragonheart

Sacrifice another creature: Until end of turn, Bogardan Dragonheart becomes a Dragon with base power and toughness 4/4, flying, and haste.

Mountain

Lightning Strike deals 3 damage to any target.

{T}: Goblin Fireslinger deals 1 damage to target player or planeswalker.

Forgotten Cave enters tapped.
{T}: Add {R}.
Cycling {R} ({R}, Discard this card: Draw a card.)

Create a number of 1/1 red Goblin creature tokens equal to two plus the number of cards named Goblin Gathering in your graveyard.

Flying
{R}: Dragon Hatchling gets +1/+0 until end of turn.

Flying
{R}: This creature gets +1/+0 until end of turn.