best blue draw cards mtg Commander Staples: Blue for Commander 10 Best One-Drops for Blue
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This is most evident in its card draw spells: almost all the card draw in red is impulse draw, named for Act on Impulse

Another option is maybe doing something like Sneak Attack out something huge, attack, then web-sling it back to your hand before the sacrifice
Kiora, Master of the Depths: It can enter at 5 loyalty and that is good because, unlike the Theros block Kiora, it cannot defend itself

Here is an example of what your mana curve should look like: 1 Mana: 12 cards 2 Mana: 78 cards 3 Mana: 56 cards 4 Mana: 34 cards 5 Mana: 23 cards 6 Mana: 01 card and 17 lands
It can also be the hardest to keep up with because of its nature, as only a handful of sets are legal in Standard in MTG at a time, and some rotate out each year