force your opponent into action, drop Vinnie, and suddenly opponents are trapped between giving you free lore, or using removal cards that cost them valuable tempo
Narset, Jeskai Waymaster Narset, Jeskai Waymaster gives you an explosive draw option at the end of your turnif you're willing to let go of your hand
Based on context, there's a chance the term "challenge" is a less confrontational version of battling or attacking an enemy card
Some examples of rare cards are Maleficent, Hades, and Genie
Hardened Scales will see this happen, and further replace that game action by making it enter with X+1 counters instead
The combination of sacrifice outlet and card draw makes it quite strong, and it only gets better once you start to exploit its ability to control the board