I'm considering these cards for the deck but I would like to hear everyone's opinions first.

Sickening Dreams - The group/s I play in uses the point system so this appears like a better kill card than Tendrils of Despair which is pretty useless outside the combo. Sickening Dreams also gives more room to my "graveyard game".

Body Double - adds flexibility/resiliency. Has a good potential to finish "interrupted" creature-based combos.

Mana Crypt - i'm sure to put this card in. Just trying to figure out which card to remove for it. Currently choosing between Mana Vault and Grim Monolith

For Mana Crypt, I would consider cutting a land. My second choice would be Crucible of Worlds (how often are you using this, given the deck's speed?).

What about Altar of the Brood? It's a win condition with both your infinite combos.

Believe it or not, I still get mana screwed every now and then so i'm not sure if I can afford to remove a land.

Good point about Crucibile. I don't get to use it that much but in theory, it helps me get to 5 to 7 lands which is important in the Palinchron/Peregrine Drake-based combos in the deck. It also allows me to keep lands in my hand so I can pitch them to Insidious Dreams. It is worth considering though.

I feel Altar of the Brood to be an unecessary redundancy since I already have Oona for my infinite mana combos, and my storm combo also allows me to setup the Peregrine Drake/Archaeomancer + Ghostly Flicker + Palinchron combo.