These are THE must keeps and I often even try to hard mull for them. The flexibility of slice is OP and sharkfin makes for the craziest openings.
Against aggro you want to keep altruis and cannons to clear and keep the board.
Against control my man Kayn is MVP. Just build a board, preferably protected by Loateb and dodge those voidlords.
Dusted Baku? Want to play Demon Hunter in wild anyway? Love fast games with broken turn 1 or 2 plays? Miss ‘ye olde pirate warriorre? This is the easy legend deck for you.