When it enters, you reveal cards from the top of your library until you find X permanents, where X is the number of colors among permanents you control
Today's story will pick up from the handoff and walk through the changes each mechanic went through during set design
Heartmender takes off negative counters from creatures you control, effectively healing them
White is vigilance, Blue is hexproof, Black is lifelink, Red is first strike and Green is trample
In a deck that wants to play things from exile - of which there are many - these are just upgraded clue tokens, because they not only cost no mana, but also have so many synergies in Commander with cards like Laelia, the Blade Reforged, who gets stronger whenever you put cards into exile
For buyers focused on maximizing their opening experience per dollar, Nihil Zero is the smart pick