Corraich is a 'free commander' meaning that you any red-white Commander deck you run can have this dwarf legend in addition to one of 13 other possibilities
If you are defined as the protector of a battle, you can use your own creatures to block any creatures attacking the battle
I do think this is reasonably busted in some kind of Bant Training Grounds deck, but that feels like a deck a YouTuber wins with but when you try it, no luck
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Red has plenty of cards like Jaxis, the Troublemaker that can make copies of your creatures, but nearly all of them require you to sacrifice or exile the creature at your end step
Any instruction, including Sidisi's first ability, that tells you to put multiple cards from a library into a graveyard moves all the cards at the same time