Combos Utilizing Dark-Triumph

Tap Tidal Warrior to turn opponent's land into an island. Use Seasinger to take control of opponent's creature. Sac that creature to avoid paying Triumph's casting cost. All your creatures get +2/+0

put phyrexian driver into play giving all mercenaries +1/+1 then sacrafice it to play dark triumph giving all mercenaries +3/+1 untill end of turn (works great in all mercenary decks)

Lingering Mirage turns opponent's land into an island. Use Seasinger to take control of opponent's creature. Sac that creature to avoid paying Triumph's casting cost. All your creatures get +2/+0

Sacrifice a blue creature to Homarid Spawning Bed for 1/1 blue creatures equal to sac'ed creature's mana cost. Cast Dark Triumph to give each of your creatures +2/+0 until end of turn.

just before blastoderm fades away, sacrifice it to give all your creatures +2/+0 till end of turn

Use Infernal Genesis to creat 1/1 creatures. Sac one of those to give all your other creatures +2/0