mtg samurai commander deck Isshin, Two Heavens as One Tribal Magic Isshin, Two Heavens as One

When a Siege battle enters the battlefield, its controller chooses a protector

Because the activation cost is so expensive, you cant really surprise someone with the ability

Bartolom del Presidio should fit into an Agatha's Soul Cauldron deck, maybe with vampire buddies like Dusk Legion Duelist and graveyard finisher Voldaren Thrillseeker, if you can also manage to go wide, this can lead to a quick finish

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While niche, this card can be used to foil any opponent's typal strategies, boost your own (especially if you're playing the Everyone's Invited Secret Lair Commander deck) or in a number of interesting infinite combos: 11