Onderzeeboot
Ecstatic Orb
is the Jeskai guy being able to chain every spell you've played so far intentional?
That jeskai knight seems ridiculously powerful! See how it plays but you might need to reduce the toughness/increase casting cost.
Rewording it using the Spelltwine template did indeed save space. I think it's less nuts than you think Alfonzo. Not that it's not nuts, but you need an instant or sorcery card in your graveyard with converted casting cost less than the card you're casting. The number of instants and sorceries is, by the nature of limited, only a fraction of your deck, and you need to draw them in the right order as well with this card. It's also somewhat hard to trigger prowess twice naturally, so I felt it was a bit weak at 2/2. I am sure it's going to be part of some blowout stories though! ("In response, Warleader's Helix on your creature, copy Mana Leak?")
Going through my designs, there's still a few cards I'm not entirely happy with, namely Defiling Druid and Skull // Bones.
I like Skull, and I like Bones, but I'm not sure the Bones part is worth playing in a deck without black. will be a lot better at getting cards in the graveyard than as well, so I might want to put the Bones half on the Skull side, but then what to put on the Bones side? I like that it's not a direct kill spell like the other colors. Maybe a Commune with Lava variant.
[tinkers]
Are these better?