All of those planeswalkers and Dragons appear in a borderless version with alternate art
These often provide tokens at your upkeep or when a creature dies, which gives you creatures to sacrifice to your sacrifice outlets
They will now put more effort into designing the card's artwork if they plan to adapt it to the OCG/TCG
However, OCG Ritual Spells also redundantly include a condition at the very start of their card text that specifies the Ritual Monsters they can Ritual Summon, in addition this being specified in the effect that actually performs the Ritual Summon
She can also return from the Graveyard if she's sent there while she has at least one monster equipped by her effect, implying she sacrificed them to revive herself
Pokemon Card Strategy: So as far as strategy goes, since Musharna is a stage 1 Pokemon card, you'll first have to get Munna into play (I reviewed Munna from this set yesterday) and then evolve Munna into Musharna