Compare this just to other morphs that flip up for a mana
When Dominating Vampire enters the battlefield, gain control of target creature with mana value less than or equal to the number of Vampires you control until end of turn
This cycle is nasty in Type Four (rules for it here - Type 4 - MTG Wiki (fandom.com)) where you have infinite mana so their casting cost is not a problem, but you can only cast one spell per turn
Casting spells and playing lands off the top is fantastic, but dont overlook the value of surveilling cards into the graveyard, because thats just more card advantage
BT16-081 SR Digimon Lv.6 MaloMyotismon Color Purple Cost 13 DP 13000 Digivolve Cost 1 Purple 5 from Lv.5 Form Mega Attribute Virus Type Demon Lord Card Text 1 [Effect] [When Digivolving] [When Attacking] By deleting 1 of your Digimon or Tamers, delete 1 of your opponent's unsuspended Digimon
Lost Dive deals a significant 240 damage and only requires two colorless Energies and one Fighting Energy