Age Line

Creatures with power less than 3 enter the battlefield tapped and cannot attack unless their controller pays {2}.
Hermione: "It's not going to work... You see this? This
is an Age Line. Dumbledore drew it himself...a genius
like Dumbledore couldn't possibly be fooled by a dodge
as pathetically dim-witted as an Ageing Potion."
Fred: "Ah, but that's why it's so brilliant!"
George: "Because it's so pathetically dim-witted."