We have to remember the payability of a card depends on the casting cost,
and its effects on others. Furnaces only costs 4, but it lets
the
opponents blasters and creatures double as well. Whereas fork
is only two
and it doubles one of whatever you are blasting (or opponent is blasting
swordsing, etc.) Which of these two is the better card.
Some say, ALL my
bolts are now 4! Where i say I can use this to swords an extra
thing, or
double a big fireball, or double one of this fireballs, or double a
berserk, or whatever I want. Fork is way better than furnace
is my
feeling. AND fork is only restricted.