White: Fakeartist
Blue: Mown
Red: Thatmarkguy
Green: Mown

White: Cato
Blue: Ace
Red: Mown
Green: Mown

White: Mown
Blue: Cato
Green: Cato

White: Ace
Blue: Steinhauser
Red: Steinhauser
Green: Mown

I don't feel comfortable calling this whole cycle on only 6 votes. I'm going to keep this open for a little while longer.

Current Tally:

White:

Mown: 2
Ace: 1.5
Steinhauser: 1
Fakeartist: 1
Cato: 1

Blue:

Steinhauser: 2.5
Mown: 2
Ace: 1
Cato: 1

Red:

thatmarkguy: 2
Mown: 2
Steinhauser: 1.5

Green:

Mown: 4.5
Cato: 2

White -- Ace
Blue -- Steinhauser (I would prefer if it said "can't untap until your next turn" to fit with Glacinorak, but meh)
Black -- Knifethrower
Red -- Cato
Green -- Steinhauser

Final Tally:

White:

Ace: 2.5
Mown: 2
Steinhauser: 1
Fakeartist: 1
Cato: 1

Blue:

Steinhauser: 3.5
Mown: 2
Ace: 1
Cato: 1

Red:

thatmarkguy: 2
Mown: 2
Steinhauser: 1.5
Cato: 1

Green:

Mown: 4.5
Cato: 2
Steinhauser: 1

thatmarkguy wins the Red tie because he voted for Mown, but Mown didn't vote.

Seal of Mirage's Skill, Seal of Frigid Winds, Seal of Demolition, and Seal of Flourishing Blossoms have been added to the spoiler!

Flavor:

Seal of Gleaming Sun –
Enchantment (C)
Sacrifice Seal of Gleaming Sun: Exile target creature you control, then return it to the battlefield under your control.
"Hide in the light
In this land with no night."
—Seal inscription

Seal of Frigid Winds –
Enchantment (C)
Sacrifice Seal of Frigid Winds: Tap up to two target creatures. They don't untap during their controller's next untap step.
"Cower while the cold wind blows;
You should have worn some warmer clothes."
—Seal inscription

Seal of Churned Earth –
Enchantment (C)
Sacrifice Seal of Churned Earth: Return target creature card from your graveyard to your hand.
"Though buried far beneath the sand,
Now rise and make your final stand."
—Seal inscription

Seal of Shattered Steel –
Enchantment (C)
Sacrifice Seal of Shattered Steel: Destroy target artifact.
"Brass or rock or ice or steel,
All are crushed beneath my heel."
—Seal inscription

Seal of Flourishing Blossoms –
Enchantment (C)
Sacrifice ~: Put two +1/+1 counters on each creature you control that entered the battlefield this turn.
"Though the stars are spelling doom,
The flowers still find ways to bloom."
—Seal inscription

I think we could probably cut the costs on the green and white ones. Historically, seals have been costed the same as an instant with the same effect, and Cloudshift sets a precedent for the costing of a flicker effect. As for the green one, compare to Moldervine Cloak or Boar Umbra.

The white one could get recosted and I'd be fine with that.
I'm not seeing the comparison between Moldervine Cloak and the green seal. Even if you equate a +3/+3 aura with with two +1/+1 counters, that doesn't take into account the fact that it could easily work on multiple creatures. It seems fine to me.

OK, I'll reduce the cost on the White one, assuming Ace of Moxes has no objections. The Green one I'm keeping the same.

no objections.