The only difference is that there is one dude who collects Alpha Animate Walls and buys all of them he can find
Once a player uses Sheiks ability, the card is shuffled back into the deck, so the player cannot use it over and over again
However, all Slivers are inherently synergistic with each other, so I don't think that has much bearing on the spike
Cyclonic Rift has been a staple of Commander for a while, and regardless of your opinion on that card, it's undeniably pretty powerful to have a similar effect
Unlimited: Look where the bottom of the T sits on this Unlimited Tropical Island
Black Knight (4 Copies, 59.59% Odds of Having at Least 1 Copy in First 8) With the recent moderation of Sinkhole, Black Knight is a great card to fill the 2-drop slot