Obviously, this is dependent on what kind of Magic: The Gathering deck youre building as a beginner, but its imperative to keep in mind
Blue Commons: Blues looking modest overall, but Doc Ock steals the show in Limited
Hold your finger along the top of your card and run it down, pushing the air out of the gap at the bottom
You can keep using one copy of Sorceress's Schemes to buy back the other copy infinitely
Gatta and Luzzu will prevent damage done to Walking Ballista, and Hardened Scales will mean that any damage done to the Ballista will translate to two new +1/+1 counters instead of one
Finally, for five mana, it lets you shuffle your library and exile the top card, letting you play it without paying the cost