As a four-mana planeswalker, Ral comes with a pretty strong passive, letting you add extra loyalty counters to him anytime you cast a noncreature spell
The same goes for the mana rock Commander's Sphere
Really, Sister of Silence wouldve been fine without the ability to counter instants and sorceries as well, thats just an extra bit of protection against those board wipes
If something moves the Melded card (to the Graveyard or Exile or whatever), it moves both physical cards
place 1 counter on this card, and if you do, reveal 1 "Gunkan" Xyz Monster from your Extra Deck, and your opponent declares 1 "Gunkan" monster's card name, except "Gunkan Suship Shari", that is mentioned on any "Gunkan" Xyz Monster, then, you add that declared card from your Deck to your hand
It is highly likely that you will either end the game with a total attack or at least deal significant damage