I get that when given the option, many people will just grab the best in slot card - its one less card you have to worry about, and it saves you having to spend time brewing your deck, right
That single trigger turns each combat step into a potential avalanche, cheating out enormous creatures while stacking overwhelming air superiority
Since they can always bounce themselves, they give you a starting place for repeated (1) ETBs, and (2) creature casts
PEEMA TRAILBLAZER Peema Trailblazer is a monster of a three drop
Riverchurn Monument is the kind of mill card that scares me, because it tends to combo with a bunch of mill favorites like Bruvac, Phenax, God of Deception, and ways to make players mill a lot of cards (Maddening Cacophony, anyone?)
Smirking Spelljacker is the next evolution of powerful Mystic Snake-type cards, and wow does this card do some degenerate stuff if you're able to counter the right spell at the right time