In theory you can have 15 lesson cards in your sideboard in Constructed decks
Sacrifice them with Lonis, CryptozoologistLonis, Cryptozoologist to steal permanents from your opponents libraries
The final Greninja is just a Double Rare Greninja ex, which isn't much of a consolation, but the thrill of opening Twilight Masquerade is undoubtedly to pull the SIR
At a WUR cost for a 1/3 flier, the stats on Zinnia are underwhelming at best, but that's complemented by two incredible abilities that tie the deck's strategy together while simultaneously offering a surprise win condition through Zinnia itself
Ive seen plenty of games where Elspeth resolved on an empty board, made three tokens, and slowly buried the table under Soldier swarms
It also appeared in the Lord of the Rings release, reskinned as Balin's Tomb