Very carefully
Without it, your opponent could chump block your massive attacker with a 1/1 token to prevent the trigger
Fiery Gambit, Krark, the Thumbless and Krark's Thumb, and Stitch in Time are just the beginning
There aren't any tutors to remove (though you could put in Demonic, Vampiric, and Grim Tutor if you need to power it up a bit), and the only infinite combos we have are infinite combat steps, which can backfire
There are a few ways to go about building these two partner commanders, with a powerful approach being a more Stax style deck with cards like Grand Abolisher and Myrel, Shield of Argive to protect your turns while drawing tons of cards from your opponent's actions, like Archivist of Oghma or Esper Sentinel
Creature - Unicorn Color tag templates(None) Loyal Unicorn Vigilance Lieutenant At the beginning of combat on your turn, if you control your commander, prevent all combat damage that would be dealt to creatures you control this turn