You may put that card on the bottom.) Land Land (CTRL to add secondary) Pay Life Demon of Fate's Design Flying, trample Once during each of your turns, you may cast an enchantment spell by paying life equal to its mana value rather than paying its mana cost
"[Type]cycling [cost]" means "[Cost], Discard this card: Search your library for a [type] card, reveal it, put it into your hand, then shuffle." This type is usually a subtype (as in "Mountaincycling") but can be any card type, subtype, supertype, or combination thereof (as in "basic landcycling")
Mono-Blue can not ramp up its mana very well and requires extensive use of mana rocks, so Mana Drain adding the mana helps you to start ramping up into your big spells
Izzet Guildgate plays well to the futuristic and industrial side of Magic: The Gathering , revealing how machinery can be just as awe-inspiring as the fantastical
I'll tell you what I look for in a processed card too
For example, the black enchantment Black Market Connections provides a nice source of mana, card draw, and tokens with Changeling that will benefit from the Sliver horde's bonus