Instant The Legend of Yangchen (As this Saga enters and after your draw step, add a lore counter.) I Starting with you, each player chooses up to one permanent with mana value 3 or greater from among permanents your opponents control
Charizard ex (199/165) Charizard cards are almost always heavy hitters in modern sets, but this particular Charizard ex stands out as the most iconic card of the 151 set
Like those, it was banned to avoid the perceived-barrier-to-entry, but was strong enough to be a candidate for banning even without the optics especially in long games where the card draw yields inevitability over time
Also, when Grimgrin attacks, you get to destroy a Creature the defending player controls, and then put a +1/+1 counter on it
Sorcery Inevitable Betrayal Suspend 3 (Rather than cast this card from your hand, pay and exile it with three time counters on it
control and outpace your opponents characters, this is hands-down the best choice to start with