cOuNTeRspELl Wizards of the Coast knew exactly what the MTG community wanted with the new Counterspell, but instead of putting the best variant in a normal Secret Lair, they made it a bonus card instead
Is there a shadowless Trainer card
The card is arguably an even better fit for Azlask, The Swelling Scourge, since that deck cares about Eldrazi spawn, and Kozilek's Command makes a ton of them
The other Spells (Monster Reborn, Desires, and Called by) are more or less self-explanatory, with the exception of the rarely played Scapegoat
Cards like Demonic Tutor and Rhystic Study are certainly way up there but when I draw one of those Im often hoping or planning to turn it into a Dockside and win the game. Matt Sperling, @sickofit Dockside occupies the role of Black Lotus (the most absurdly efficient ritual in the format) on my EDH Power 9 list
If your opponents don't act, it's only a matter of time until they get Gnomed by your massive army of tokens that just keeps getting bigger and harder to deal with