All of these, along with how many Treasure tokens you can create, make it trivial to reach the 30 artifact threshold you need to win the game with Knuckles' Treasure Hunter effect
And the hitters dont come much bigger than Jumbo Cactuar
9: You get an emblem with "At the beginning of your end step, search your library for a permanent card, put it onto the battlefield, then shuffle." 0: Draw a card
Unfortunately, this also means that blues methods for mana ramp really arent all that well defined, resulting in a very limited pool of cards to choose from without adding other colors, many of which are also mechanically unique
You want high Strength, not high Willpower on your Rush characters
If there's a cost associated with having that creature block, its controller isn't forced to pay that cost, so it doesn't have to block in that case either