Usable by any champion. Roll 2d6 for the bonus of this card, and 1d4 for a bonus to the opposing champion if the user is not a monster. Spells and psionics cannot be used by either champion for the remainder of this round of combat. (Off 4)
Copyrights:
TSR
Wizards of the Coast
This is the weakest unarmed combat cards in the Millenium set. While it can be used with cards like Rigged Dice (22/MI), this card really isn't worth it, as it grants just a bonus of +11 to +8 (or +12 with a monster). However, for the most part, the icon bonus will average at +7 (or +4.5 if used by a non-monster), which is a useful bonus, but nothing worth writing home about.
Headbutt can be used by any champion, bu not every deck, since the final line restricts the user, as well as the victim, from using spells or psionics, it should never be included in any deck that uses either of those types of cards. Similar unarmed combat cards include Slap! (78/IQ) (for non-spellcaster to counter a psionic power or spell as it is played), Uppercut (93/RR) (for heroes), Choke Hold (436/4th) (for heroes against spells), and Tail Sweep (92/DR) (for dragons).
These cards are often not as strong as Headbutt if you don't intend to play spells or psionics, but Headbutt's varying icon bonus (that feasably could even be negative) doesn't make Headbutt worth the risk, except maybe in an all monster deck.