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His +4 will exile discard, so when you start targeting your foes, and that's pretty quickly going to get cards cast

[20] On each player's turn, following a set phase order, they draw a card, tap their lands and other permanents as necessary to gain mana to cast spells, engage their creatures in a single attack round against their opponent who may use their own creatures to block the attack, and then complete other actions with any remaining mana

Given that the deck is structured around all mana colors, you'll need to ensure your chosen Commander has all five mana colors anywhere on the card

Thrakkus the Butcher is a little on the smaller side compared to its full Dragon friends, but when it attacks, it doubles the power of all Dragons you control until end of turn