go second
1) forest, arbor elf, 20 life left, 8 cards drawn, 2 used
2) mountain, somberwald sage, 20 life left, 9 cards drawn, 4 used
3) mountain, abundant growth (draw 1 card, target forest), (tap elf to untap forest, tap forest for red), pillar of flame (target opponent), (tap sage for black), rakdos, lord of riots, 18 life left, 11 cards drawn, 8 used
4) forest, swing with rakdos, if rakdos would deal less than 4 damage, giant growth, on rakdos, worldspire wurm, <14 life left, 12 cards drawn, 9/10 used
(if rakdos deals 6 or more damage, do next turn now), 0 life left, 11 cards drawn, 10/11 used
5) fling (sacrifice wurm, target opponent), 0 life left, 13 cards drawn, 10/11 used
use lair delve and tracker to find needed cards
best case: 11 cards, worst case: 12 cards
swamps are unnessecary, the sage will always tap for black.
this might actually work.
probably not, though.