This spell costs {X} less to cast, where X is the greatest number of artifacts an opponent controls.
Flying, trample, haste
Whenever Cavern-Hoard Dragon deals combat damage to a player, you create a Treasure token for each artifact that player controls.
6 /
6
{1}{R}{R}
Chaos Dragon
Creature - Dragon
Flying, haste
Chaos Dragon attacks each combat if able.
At the beginning of combat on your turn, each player rolls a d20. If one or more opponents had the highest result, Chaos Dragon can't attack those players or planeswalkers they control this combat.
4 /
4
{2}{G}
Choose Your Weapon
Instant
Choose one --
• Two-Weapon Fighting -- Double target creature's power and toughness until end of turn.
• Archery -- This spell deals 5 damage to target creature with flying.
{4}{B}{R}
Dragonlord Kolaghan
Legendary Creature - Elder Dragon
Flying, haste
Other creatures you control have haste.
Whenever an opponent casts a creature or planeswalker spell with the same name as a card in their graveyard, that player loses 10 life.
6 /
5
{G}
Gaea's Might
Instant
Domain -- Target creature gets +1/+1 until end of turn for each basic land type among lands you control.
{3}{R}{R}
Glorybringer
Creature - Dragon
Flying, haste
You may exert Glorybringer as it attacks. When you do, it deals 4 damage to target non-Dragon creature an opponent controls. (An exerted creature won't untap during your next untap step.)
4 /
4
{3}{R}{R}
Goldspan Dragon
Creature - Dragon
Flying, haste
Whenever Goldspan Dragon attacks or becomes the target of a spell, create a Treasure token.
Treasures you control have "{T}, Sacrifice this artifact: Add two mana of any one color."
4 /
4
{G}
Groundswell
Instant
Target creature gets +2/+2 until end of turn.
Landfall -- If you had a land enter the battlefield under your control this turn, that creature gets +4/+4 until end of turn instead.
{4}{R}{R}
Hellkite Courser
Creature - Dragon
Flying
When Hellkite Courser enters the battlefield, you may put a commander you own from the command zone onto the battlefield. It gains haste. Return it to the command zone at the beginning of the next end step.
6 /
5
{3}{R}{R}
Hunted Dragon
Creature - Dragon
Flying, haste
When Hunted Dragon enters the battlefield, target opponent creates three 2/2 white Knight creature tokens with first strike.
6 /
6
{3}{U}{R}
Hypersonic Dragon
Creature - Dragon
Flying, haste
You may cast sorcery spells as though they had flash. (You may cast them any time you could cast an instant.)
4 /
4
{4}{R}{R}
Inferno of the Star Mounts
Legendary Creature - Dragon
This spell can't be countered.
Flying, haste
{R}: Inferno of the Star Mounts gets +1/+0 until end of turn. When its power becomes 20 this way, it deals 20 damage to any target.
6 /
6
{2}{G}
Invigorate
Instant
If you control a Forest, rather than pay this spell's mana cost, you may have an opponent gain 3 life.
Target creature gets +4/+4 until end of turn.
{G}
Might of Alara
Instant
Domain -- Target creature gets +1/+1 until end of turn for each basic land type among lands you control.
{3}{U}
Mystical Teachings
Instant
Search your library for an instant card or a card with flash, reveal it, put it into your hand, then shuffle.
Flashback {5}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{2}{R}{ // }{2}{W}
Onward // Victory
Instant // Sorcery
Target creature gets +X/+0 until end of turn, where X is its power.
Aftermath (Cast this spell only from your graveyard. Then exile it.)
Target creature gains double strike until end of turn.
{3}
Phyrexian Dragon Engine
Artifact Creature - Phyrexian Dragon
Double strike
When Phyrexian Dragon Engine enters the battlefield from your graveyard, you may discard your hand. If you do, draw three cards.
Unearth {3}{R}{R}
(Melds with Mishra, Claimed by Gix.)
2 /
2
{2}{R}
Soul's Fire
Instant
Target creature you control deals damage equal to its power to any target.
{3}{R}
Stirring Bard
Creature - Dragon Bard
Defender
When Stirring Bard enters the battlefield, you take the initiative.
Mantle of Inspiration -- {T}: Target creature gains menace and haste until end of turn.
0 /
4
{B}
Tainted Strike
Instant
Target creature gets +1/+0 and gains infect until end of turn. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
{1}{R}
Temur Battle Rage
Instant
Target creature gains double strike until end of turn.
Ferocious -- That creature also gains trample until end of turn if you control a creature with power 4 or greater.
{2}{R}{R}
Territorial Hellkite
Creature - Dragon
Flying, haste
At the beginning of combat on your turn, choose an opponent at random that Territorial Hellkite didn't attack during your last combat. Territorial Hellkite attacks that player this combat if able. If you can't choose an opponent this way, tap Territorial Hellkite.
6 /
5
{4}{W}{U}{B}{R}{G}
The Ur-Dragon
Legendary Creature - Dragon Avatar
Eminence -- As long as The Ur-Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost {1} less to cast.
Flying
Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.
10 /
10
{2}{W}{U}{B}{R}{G}
Tiamat
Legendary Creature - Dragon God
Flying
When Tiamat enters the battlefield, if you cast it, search your library for up to five Dragon cards not named Tiamat that each have different names, reveal them, put them into your hand, then shuffle.
7 /
7
{1}{G}
Titanic Growth
Instant
Target creature gets +4/+4 until end of turn.
{2}{R}{ // }{1}{R}
Two-Handed Axe // Sweeping Cleave
Artifact - Equipment // Instant - Adventure
Whenever equipped creature attacks, double its power until end of turn.
Equip {1}{R}
Target creature you control gains double strike until end of turn. (Then exile this card. You may cast the artifact later from exile.)
{1}{R}
Unleash Fury
Instant
Double the power of target creature until end of turn.
{G}
Vines of Vastwood
Instant
Kicker {G} (You may pay an additional {G} as you cast this spell.)
Target creature can't be the target of spells or abilities your opponents control this turn. If this spell was kicked, that creature gets +4/+4 until end of turn.