Played this deck the day prior to posting, and I came in 2nd without losing any match (yes one was a tie).Round 1: vs Kiki-Chord Game 1: He comboed off with Kiki-Jiki and I had no answer Game 2: Went to turns, but ended up controlling the board as he never got a Spellskite into play. I slowly milled the opponent, flickering Drowner of Hope multiple times per turn (he had almost 30 cards in his deck when I started having him mill three a turn and stopped when I saw a land on top thanks to Courser of Kruphrix). Round 2: vs Jund (not sure exactly, games were really short) Game 1: Aggro win with two Reality Smashers (and a Mimic) Game 2: I never got a creature with power 4 or greater out. Opponent was missing land drops and when he had four mana, he cast Damnation, but I had Stubborn Denial in hand to counter.Round 3: vs Jund Game 1: I won this match with Reality Smasher (can't really remember the full match) Game 2: I lost with my opponent having three Tarmogoyfs out. Game 3: Slow start and he was mostly controlling the board and my hand, but was able to get him to 5 life, yet I was at 6 (he had a bolt in hand I knew about) and he had a land creature in play. Top decked a Drowner of Hope and was able to tap down the attacker. I technically won by milling the opponent as I drew a Eldrazi Dsplacer the next turn, but would have won just by swinging as his land creature was already tapped. Round 4: vs Zooicide Game 1: Lost to a +13/+13 creature that gained infect and trample (my 2/1 Mimic couldn't stop this) Game 2 and 3: Won as I was able to play both Spellskite and Displacer in each game, tapping down his creatures before they could attack, and moving all pump spells to Spellskite. This makes me consider increasing Spellskite's count to 3 in the side (or maybe one in the main deck) to fight this deck as well as Infect. I played slower this game as I wanted to have mana up for Displacer (I had Training Grounds out and was able to flicker four creatures of his per turn), and won when I finally was able to play Drowner of Hope with Displacer and Training Grounds on the battlefield. NOTE: He never played a Death's Shadow all three games.
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The Altar was very relevant against a Kiki-Chord Player, as I could flicker any of my creatures to force a mill (was even more useful as he had a Courser of Kruphix out, so I was literally playing Eldrazi lantern control at that point!). And it's also another wincon in case your aggro strategy is shut down with Worship or a bunch of Prison cards (I'm looking at you Ensnaring Bridge). It took two turns to mill them out. If you flicker Drowner (at most) 15 times with Altar out, you usually deck the opponent.Spawnsire is indeed a slow card, and is only useful in grindy matches, but it's possible to play him with all of the Scions we do produce, but I could see it being cut.I don't like Worship in the board, however it's great against the mirror or any other aggro decks (although it doesn't stop Infect from what I understand). It deserves a place if you cut the two Eldrazi I have sitting in my board, but it's not needed from what I so far tested. That may change with the meta though.As for Rest in Piece, I rather play Relic of Progenitus instead if given the choice.