One is generally awarded as a participation promo to anyone who plays in a Standard event thats part of the promotion
Also, since he is an effect that activates a Continuous Spell, it is worth noting that both effects will fail if this card is no longer face-up on the field due to chain activation effects
For example, if you control another permanent with an ability that triggers at the beginning of your postcombat main phase and that ability is on the stack below Sorin of House Markov's last ability, there will be an opportunity for your opponent to remove Sorin, Ravenous Neonate before you can activate one of his abilities
Watch out for those Wan Shi Tong MTG players at the table, though
I tend to associate yellow with a vague concept of "light" (holy digimon, digimon associated to light or with light based attacks, electric digimon, Virus Busters or other digimon associated with justice like the Knightmons, and digimon associated with health or healing) so it's odd to me to see Sukamon's family in yellow as they don't even kind of fit any of my prior already vague categories
Creature - Cleric Tiefling Color tag templates(None) Dimir House Guard Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Sacrifice a creature: Regenerate this creature