Whenever this creature attacks, you win the game if there are twenty or more counters on it or you have twenty or more cards in hand
It's the first time we've seen this ability printed like this in spell form that can be cast instantly, and not targeting one dork like Diminish
Chaos Dragon Chaos Dragon is a 4/4 flier with haste that needs to attack every turn hardly a downside since you want to, anyway
A very basic pay to venture artifact that can also be used for a bit of mana ramp if youre in a bind
This means that all permanents retain their other types in addition to being artifact creatures.) This combination not only causes all kinds of shenanigans, the least of which is most certainly not the fact that all lands die because of being creatures with 0/0 power/toughness (unless there's something else increasing their toughness), but it also allows many interesting interactions with non-creature permanents that are not normally possible (because most of the "interesting" interactions usually target creatures and nothing else.) Just to mention one of the numerous possibilities, take for example the situation where Clone enters the battlefield as a copy of Garruk Relentless
It's also possible that external factors affected the results, particularly other events distracting from the Practice room data
