All the Battles in this set have the subtype Siege, implying that future Battles might play out differently
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But just like Karplusan Yeti above, I think this is simply a product of early MTG where some of the card artwork don't quite have the main creature it's supposed to be depicting in the main focus
The first is mobilize, the Mardu mechanic, which is a creature mechanic that triggers when a creature with mobilize attacks, creating a number of 1/1 red Warrior creature tokens that enter attacking
The classic method is to use cost-reducers like Goblin Electromancer, Helm of Awakening, Semblance Anvil or the Medallion cycle