SRD pisze:Counterspelling Metamagic Spells
Whether or not a spell has been enhanced by a metamagic feat does not affect its vulnerability to counterspelling or its ability to counterspell another spell.
Choć ja traktowałbym to zaklęcie jako zaklęcie wyższego poziomu na potrzeby kontrczarowania... W końcu:
SRD pisze:Unlike other metamagic feats, Heighten Spell actually increases the effective level of the spell that it modifies. All effects dependent on spell level (such as saving throw DCs and ability to penetrate a lesser globe of invulnerability) are calculated according to the heightened level.