FireFist, beating heart

Partner with TR1, defiant smile
Partner with MacMagic, cunning intellect

{r}{r}: FireFist, beating heart gets +X/0 until
end of turn, where X is twice the number of creatures with partner with [] you control.
You may only activate this ability Y times a turn, where Y is the number of creatures with partner with FireFist, beating heart you control plus 1.