If you copy a spell that requires an additional cost (such as discarding a card), you do not need to pay the extra cost again
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What you might not be aware of is that there's actually a rule in the game dictating that you cannot change the order of cards in your Graveyard, as reasons that this would matter are extremely rare
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And even if you don't "charge it up" by repeatedly reanimating creatures that cost less than 3, roughly 75% of the creatures in my deck are 3 or less anyway and among those are some really impactful targets like Eternal Witness, Reclamation Sage, Six, and Accursed Marauder just to name a few
Id say a little high on costs for activation, but synergizes well with the commander if you have food tokens lying around