At your eot, sac the eidolon to have you lose a life and I'll gain one.
UU
Play Mountain
Play Rakdos, The Defiler (Return Eidelon to my hand)
Done
Spidey: 20 19?
Hand: 10 (incl Plains)
In Play:
(U) Forest *Sprawled*
(U) Plains
(T) Mt
(T) Azorius Chancery (~ CIP Tapped. When ~ CIP, return a land I control to its owner's hand. T: Add WU to my mana pool)
Utopia Sprawl (As ~ CIP, choose a color [BLUE]. Whenever enchanted Forest is tapped for mana, its controller adds one mana of the chosen color to his mana pool)
(U) Azorius Signet (1, T: Add WU to my mana pool)
(T) Freewind Equenaut (2/2; Flying; As long as ~ is enchanted, it has "T: ~ deals 2 dmg to target attacking or blocking creature")
(U) Enigma Eidolon (2/2; U, Sac ~: Target player puts the top 3 cards from his library into his graveyard. Whenever I play a multicolored spell, I may return ~ from my graveyard to my hand)
Graveyard: Helium Squirter
RFG:
BigBlue: 14 15?
Hand: 11 (incl Swamp)
In Play:
(T) Azorius Signet (1,T: UW)
(T) Plains
(T) Swamp
(T) Rakdos Carnarium (T: RB; Cip Tapped; When ~ cip, I return a land I control to owner's hand)
(T) Mountain
(U) Haazda Exonerator (1/1; W,Sac ~, T: Destroy target Aura)
(S) Rakdos, the Defiler (7/6; Flying; Trample; When ~ attacks, I have to sacrifice 1/2 my non-demon permanents. When ~ deals dmg to a player, that player sacrifices 1/2 their non-demon permanents)
Graveyard: Seal of Doom
RFG:
(Hand) Entropic Eidelon (2/2; B,Sac: Target opponent loses 1 life and I gain 1 life. When I play a Multicolored spell, I may return ~ from my gy to my hand)