Kappa Cannoneer It's Blastoise
It works great with cards you can repeatedly cast, like Whitemane Lion and Kor Skyfisher
This can be prevented by your opponent paying mana equal to the sentinels power
Rhystic Study often gets a draw off of every spell an opponent casts even when they know the unwritten rule when facing a Rhystic Study- "ALWAYS PAY FOR RHYSTIC STUDY." And make no mistake, always pay
Alternatively, you can attack with her and then tap her to draw that card post-combat or right before your next turn to keep the momentum up
Obviously, youre not going to be destroying all other creatures in Limited, but thats fine, shes still really great, though keep in mind life gain isnt an absolutely massive theme in the set The Ancient One can get you to Descend 8 pretty quickly with that abilitybut this still amounts to being a two mana 8/8 that doesnt impact the board in the early game, and by the time youve invested six total mana you still might not quite be at the point where he can attack and block