Later Magic sets (such as Vintage Masters seen in the Force of Will example above), have both the collectors number , set code , and rarity in the lower lefthand corner of the card
Skilled, experienced deck-builders have some developed statistical intuition and, of course, do not need to calculate such statistics all the time
Obviously, if you can get some poison on your opponent, it gets a lot better as one mana a turn to tap something often just feels like removal
Invasion of New Phyrexia / Teferi Akosa of Zhalfir Im a big fan of army-in-a-can cards
Exile is often been a place to temporarily hold cards for other abilities like suspend, adventure, and flicker effects
Some decks shrug these off, and they wont win, but decks that go wide or players who care more about curving out than paying to attack you give you plenty of time to assemble some wicked win conditions