Perhaps one of the most well-known and most played card that lets you do this is Aether Vial, a Modern all-star that you can tap to put a creature into play from your hand so long as that creatures mana value equals the number of charge counters on it, which you can choose to add at the start of your turn
It is thought that there were at least 2 German copies printed, meaning that only 1 or 2 copies of the Italian and French variants were ever distributed
It feels like The One Ring all over again, but to a lesser caliber
Just enter the name of the front side "Daybreak Ranger" or "Daybreak Ranger // Nightfall Predator"
Boosted by the more difficult hit rates of Twilight Masquerade and its easy to see why Kieran garners it's price
Clearly intended to mess with the current meta and mix things up for people relying on the same three decks in all their battles, it should make online competition far more interesting until the arrival of a full new set in January