Dwarven Clanlord
3RRR
Summon Dwarf, 1/2
All dwarves in play gain +1/+1.
2RR: Bring a Dwarven Clan token into play. Treat this token as a 1/1 red creature.
When the banners are unfurled and the drums start playing, all answer the Call of the Clan. -- ancient dwarven saying

Dwarven Pathfinder
2RR
Summon Dwarf, 1/1
All dwarves in play gain mountainwalk.
None can find their way underground as well as a Pathfinder.

Dwarven Warmaster
4RR
Summon Dwarf, 2/2
When Dwarven Warmaster is brought into play, choose one of the following abilities: Bands with other dwarves (treat as banding, but usable only with other dwarves); First strike; or Trample. All dwarves in play gain this chosen ability as long as Dwarven Warmaster remains in play.

Gryphon
2WG
Summon Gryphon, 3/2
Flying, first strike.
Part lion, part eagle, the gryphons of Dominia are renowned for their nobility and their ferocity.
(Note: I included this card in the expansion I sent to WOTC.)

Mana Tax
3UUB
Enchantment
Pay two life points per opponent to bring this card into play. During your upkeep, pay one life point per opponent or bury Mana Tax.
0: Take one point of mana from opponent's mana pool. Treat this as an interrupt. You may choose the color of the mana taken, if applicable. Pay one life point.

Decoy
R
Enchant Creature
When attacking with target creature, place both this card and the creature card face down after shuffling them out of your opponent's sight. Your opponent must treat both cards as separate creatures for the purpose of assigning blockers. After blockers have been assigned, turn over both cards; the creatures blocking the Decoy card cannot be reassigned.

Animate Land
GG
Enchant Land
Target land is now a 1/1 artifact creature as well as a land card. It can be tapped either as a creature or as a land.

Astral Plane
Land
Tap: Draw a card from your library and add it to your hand. Draw another card from your library and remove it from the game. Treat this as an interrupt.

Celestial Realm
Land
Tap: Add W to your mana pool. Treat this as an interrupt.
Tap: Give one creature in play +0/+2 for the rest of the turn.

Dreamland
Land
Tap: Add U to your mana pool. Treat this as an interrupt.
Tap: Give one creature in play flying for the rest of the turn.

Ethereal Plane
Land
Tap: Add X colorless mana to your mana pool. X is the number of Ethereal Planes in play. Treat this as an interrupt.
(Note: I included this card in the expansion I sent to WOTC.)

Life Realm
Land
Tap: Add G to your mana pool. Treat this as an interrupt.
Tap: Regenerate one creature in play.

Nether Realm
Land
Tap: Add B to your mana pool. Treat this as an interrupt.
Tap: Give one creature in play +2/+0 for the rest of the turn.

Primal Chaos
Land
Tap: Add R to your mana pool. Treat this as an interrupt.
Tap: Give one creature in play first strike for the rest of the turn.