This idea has been germinating for a long time. It started when I saw Dwarven Undead in a D&D Fiend Folio or Monster Manual. Dwarven Undead started out as an unimpressive
Drowned knock off:
Dwarven Undead
1R
Creature -- Zombie Dwarf
1/1
B: Regenerate Dwarven Undead
My first attempt at Elvish Undead (later Yavimaya Undead when I decided to associate all elves I created with Yavimaya) was much more interesting:
Elvish Undead
BB
Creature -- Zombie Elf
2/1
Forestwalk
Whenever Elvish Undead attacks, the defending player may sacrifice a Forest. If that player does, prevent all combat damage that would be dealt by Elvish Undead this turn.
This one reminds me of
Mtenda Lion.
I toyed with the following for Dwarven Undead:
Dwarven Undead
BB
Creature -- Zombie Dwarf
2/1
Mountainwalk
At end of turn, if Dwarven Undead is in your graveyard with a land card directly above it, you may return Dwarven Undead to play.
(I also considered "At end of turn, if Dwarven Undead is in your graveyard with a Mountain card directly above it, you may return Dwarven Undead to play"; however, both versions were considerably more powerful than (and different from) Elvish Undead. These, of course, are reminiscent of
Krovikan Horror.)
Going back to my Elvish Undead template, I came up with this:
Dwarven Undead
BB
Creature -- Zombie Dwarf
2/1
Mountainwalk
Whenever Dwarven Undead attacks, the defending player may discard a Mountain card. If that player does, prevent all combat damage that would be dealt by Dwarven Undead this turn.
Not as harsh a cost as Elvish Undead; however, black and red are not enemies like black and green are.
Next came Merfolk Undead:
Merfolk Undead
BB
Creature -- Merfolk Zombie
2/1
Islandwalk
Whenever Merfolk Undead attacks, the defending player may return an Island he or she controls to its owner's hand. If that player does, prevent all combat damage that would be dealt by Merfolk Undead this turn.
Also not as harsh a cost as Elvish Undead (same logic as above). I also considered the harsher:
Merfolk Undead
BB
Creature -- Merfolk Zombie
2/1
Islandwalk
Whenever Merfolk Undead attacks, the defending player may tap all lands he or she controls. If that player does, prevent all combat damage that would be dealt by Merfolk Undead this turn.
I haven't come up with a white card to complete the cycle yet (of course, there is no black card as a Zombie Undead would be redundant). What do you think? I like Elvish Undead the best, I'm not sure I can come up with a fourth variation on the theme for a white card...
Edit: If you're thinking, "what's up with the landwalking?" I've decided that landwalking will be a major theme of the set I'm developing, so expect to see more of it from me...