You want to hit your marks
According to Ravensburger, they are much rarer than the Enchanted cards (which is as astounding considering finding an Enchanted card is about 1 in 1,200 cards)
For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Sin's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature
Each event had two playmats and four Stitch, Rockstar promo cards for prizes, spread out to the top four finishers
Steels slower pace can make it a good ink colour to pair with sapphire cards, which can provide the extra ink you need to get big cards out earlier, or a faster colour such as ruby, which can provide some faster options earlier in the game