Both draw cards upon entering the battlefield and have potentially huge power and toughness that correspond to the cards drawn in some way
For legendary creature-focused decks, the front side tends to be better whereas more open decks and planeswalker ones the backside is better
You can also sit behind these cards on a stalled board, relying on them to pressure opposing life totals while everybody else stares at each other over imposing boards
A curve of creatures, most of which with different modes or abilities, backed up by some flexible removal
This degenerate Gobbo borrows all of your foes mana-producing artifacts when they get tapped, allowing you to absolutely pop off with beaucoup mana taken from your foes mana rocks, likely leading you to a massive turn that might potentially end the game on the spot
You can normally only ink once per turn