If Elemental Mastery is attached to Tajic, the ability granted to Tajic checks what is Tajic's power, and creates that many Elemental tokens, when that ability resolves (C.R. 608.2c, 608.2g). For example, if Tajic's power is 7, then seven Elemental tokens will be created this way.
If you just tap it for tokens during your main phase (and there are no glorious anthem effects or anything): 2 tokens
If you attack in a way that triggers Battalion once, untap Tajic in the same turn with an effect like Seize the Day, and then tap it for tokens: 7 tokens
Do note that the battalion effect stacks with itself if you trigger the ability multiple times (such as if you have aggravated assault and a lot of mana), which would let you produce more and more tokens (5 more tokens for each time it gets the boost).
enchanted by Elemental Mastery
How many Token?
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If you attack in a way that triggers Battalion once, untap Tajic in the same turn with an effect like Seize the Day, and then tap it for tokens: 7 tokens
Do note that the battalion effect stacks with itself if you trigger the ability multiple times (such as if you have aggravated assault and a lot of mana), which would let you produce more and more tokens (5 more tokens for each time it gets the boost).