Sadistic Sacrament could be fun. Perhaps include some ingest eldrazi(culling drone, sludge crawler, dominator drone). Nightveil Specter. Shimian Specter. Ulamog, Ceaseless hunger. I made this happen: http://www.mtgvault.com/drgnlvrrex/decks/dare-ya-tshuffle-30/ It was not fun to play against I hear.As a side mention: the deck is called "dare ya t'shuffle" because the very first version of the exile happy deck was trying to make the opponent shuffle a lot and take damage from psychogenic probe.
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by turn 8 you have only about a 40% chance of having a single reactor. I think you should consider adding more reactors, reducing the deck size and making some decisions about the combo cards like pariah and darksteel myr, which will often be dead draws as the other piece to the combo could be 30 turns away. Decreasing the deck to 60 cards and increasing the reactors to 4 increases the odds of having a reactor drawn to about 70% by turn 8. So I would say if you remove cards like darksteel myr, pariah, lightning greaves, platinum empirion, etc. you will find greater success in achieving a win with the reactor. I would also like to suggest cards like Luminarch Ascension which will give you an outlet for excess mana and keep your opponents busy while you charge up the reactor. Luminarch ascension could also serve as an alternate win condition and goes well with the theme of your deck, since it puts out tokens after you have not taken damage on opponents' turns.
preordain is banned in modern this may be why.
I recommend Mirran Spy :D
aha! This is well observed. I have added one to the sideboard for consideration! Thank you for the suggestion. I was intrigued by the gleeful sabotage initially for the two for one destruction it could do, using the mana dorks to copy it. When I have a chance to play test the deck, which may be awhile, I will see how both feel.
Aha! I like the idea with Trading post and Scuttling doom engine. I didn't connect how these worked together previously.
How do you feel about hold at bay or riot control?