If a creature loses double strike after assigning damage in the first strike combat damage step (due to Boldwyr Aggressor leaving the battlefield, for example), that creature won't assign damage in the normal combat damage step
You can even couple it with a board wipe to your opponent and they get milled for as many cards as you destroyed
Wizards of the Coast changed the Universes Beyond releases with a complete set of The Lord of the Rings: Tales of Middle-earth ( LTR )
You can sacrifice every other creature in the deck to its casualty ability, and the guaranteed copy effect means Parnesse plays better with your commander, rather than the other way around
Cards like Katlida, Dawnhart Prime and Jiang Yanggu, Wildcrafter makes all of your creatures into mana dorks, which removes the need for some of the obnoxious precon cards like Somberwald Sage and gives you more flexibility to do what you want
So, a Ruby/Sapphire card that provides an ink ramp (a Sapphire hallmark) can be placed in a Ruby deck, providing more options and versatility
