Secret Box is an Ace Spec card, meaning that players can only use one copy of it in their decks
It's set in the 90s at a middle school during the Urza block of the game
Even worse, it leaves you down a Jumbo Cactuar, and once you've shown your ruthlessness, the remaining two players will have no qualms about responding Escape Tunnel is likely to be another popular interaction
Some decks will still prefer the 1-drop, but this has combat stats, sacs artifacts, and surveils instead of scrying, which is all major upsides on a free sac outlet
Indestructible (Damage and effects that say "destroy" don't destroy this creature.) If Darksteel Colossus would be put into a graveyard from anywhere, reveal Darksteel Colossus and shuffle it into its owner's library instead
Only occasionally do the lines blur between lands and spells