"Life is an endless party for the carefree satyr. It is said that if a satyr were to become depressed it would kill him as certain as any blade."Summon Satyr is a second-level Nature Magic spell in Heroes of Might and Magic IV that costs three spell points and summons a number of satyrs based on the level of the caster.
As with most level 2 and 3 summoning spells, the number of Satyrs you can summon with this spell probably isn't enough to really affect the battle.
Satyrs can cast the Mirth spell twice, which can be somewhat useful, and this is probably the only reason you'd use this spell, unless you're desperate for some melee support.