Deep-Slumber Titan Four mana for a 7/7 would be a great deal, but the drawback on this card is just a little too big
If an effect allows you to spend mana "as though it were mana" of any color or type, that allows you to spend mana you couldn't otherwise spend, but it doesn't change what mana you spent to cast the spell
I dont know if others have the same problem, but I found it extremely annoying
For now, it's an excellent investment, and probably the safest one in the entire Modern Horzions 2
And since Edge of Eternities takes us to an all-new area of the Magic Multiverse, it's a great first step into the wide world of Magic
As it produces mana however you can more reliably offset the cost of it and continue to go off after playing it in the right situation