Predator Dragon

Flying, haste
Devour 2 (As this enters, you may sacrifice any number of creatures. This creature enters with twice that many +1/+1 counters on it.)

Goblin Arsonist

When Goblin Arsonist dies, you may have it deal 1 damage to any target.

Create two 1/1 red Goblin creature tokens.

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

{T}: Create X 1/1 red Goblin creature tokens, where X is the number of Goblins you control.

Enchant creature
When Dragon Mantle enters, draw a card.
Enchanted creature has "{R}: This creature gets +1/+0 until end of turn."

Arc Lightning deals 3 damage divided as you choose among one, two, or three targets.

Flying (This creature can't be blocked except by creatures with flying or reach.)
{R}: Shivan Dragon gets +1/+0 until end of turn.

Lightning Bolt deals 3 damage to any target.

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. (It can attack and {T} this turn.)

Menace (This creature can't be blocked except by two or more creatures.)

Lightning Strike deals 3 damage to any target.