I've been testing today, I leave some impressions from the 3 pairings i've played:
1- Ill'gotten gains: I know, this is not a tier 1 but... I won 5-2 just losing to nuts like: swamp ritual necro or swamp duress lotus ritual ritual tutor etc... first turn. I cannot take conclusions but the combo pairing seems to be quite favorable.
2- Dragon: U/B version with deeps this creature with evoke and no squee's... i've gone like 5-4 or 6-4, this match is less favorable than storm cause he canjust discard a dragonand seat until he cango necromancy EOT, animate+animate+FoW. as he is not playing squees I started winning more matches when I target his black mana instead of his bazaars with wastelands...

3- Drain tendrils: provably the most interesting one. We finally went 6-3 or 6-4, the match is even to slightly favorable. The matches I lost went allways the same (excep for one that involved land mox mox lotus repeal on mox mox ETW):
1- I take the control of the match with counters, rod and some strips... but i cannot find the angel so the game goes sooooooooooo long.... that he has time to draw to many lands and play all his bombs in one or two turns until one them resolves. I wouldn't have lost the major part of this games if I'd played B2B or crucible... This deck really needs to reuse strip effects for the control match if we are not playing B2B so i'll make room for one CoW.
No sideboard tested yet.
cheers,
Wettee