Opt is the kind of card that can actually warp manabases to support it, and with Boon of the Wish-Giver you dont have to worry about that its very easy to cycle on Turn 1 regardless of what else you have, and very easy to slot it somewhere else in the curve
But, stapling two narrow effects on to a single card does make a huge difference, and that modality is enough for this to make the cut in your deck sometimes This costs a ton of mana, but it does do something that will win you the game in most cases
The reason that Jetmir, Nexus of Revels makes the top of the list is simple: It wins the game
If the subgame is a draw, no player won the subgame, so nobody gets to put a permanent onto the battlefield in the main game
Legion Loyalist Legion Loyalist is one of the better battalion creatures because it doesnt just give itself beneficial abilities: it gives them to all your creatures
Purphoros rewards you for flooding the board with tokens, damaging each of your opponents in a jiffy