At that point you already have ten green sources, so why not play some green cards
While this cost reduction comes at the cost of reducing the power and toughness of each of your creatures by -1/-1, the inherently sizable nature of Demons causes this drawback to be rather negligible for Demon-tribal decks
The issue doesnt really end there, though, and much to the chagrin of many players who feel like it does, I want to explore it a little deeper
Special Summoned X monsters can gain resistance to target and effect destruction for that turn, and if the Time Thief Deck is a rank 4 Deck, for example, hope will be connected to prevent it from being removed before battle
Its nice to see cards like Tekuthal, Inquiry Dominus, and Cyberdrive Awakener, too
Excluding the starting 5 cards and initial draw, this is 30 cards, or 15,000 additional life points, which would give you 23,000 in total to buffer damage