how to add cards to sideboard mtg arena

how to add cards to sideboard mtg arena still sucks, outside of pairing me vs the same decks all the time, but the ridiculous hands and then this can't glitch (3rd time now). | Gabriel Janky Sideboard broken for anyone else?

Name: how to add cards to sideboard mtg arena still sucks, outside of pairing me vs the same decks all the time, but the ridiculous hands and then this can't glitch (3rd time now). | Gabriel Janky Sideboard broken for anyone else?
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SKU: 3926186588
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SKU: 3926186588

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Description

Vitu-Ghazi Guildmage Vitu-Ghazi Guildmage is a two-mana card requiring both one Green and one White mana

Activating the regeneration ability creates a replacement effect that acts like a shield, replacing the next time Skithiryx would be destroyed that turn