If you wish to cast the revealed card without paying its mana cost, you must cast it while Yennett's triggered ability is resolving
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That said, I think that 3 toughness and not having some form of protection is detrimental for this cards playability in formats like Standard, but its still interesting in EDH or in enchantment-heavy decks
SE Secret Rare Gem-Knight Fusion X SPELL Fusion Summon 1 "Gem-Knight" Fusion Monster from your Extra Deck, using monsters from your hand or field
Thats how the sentence came about: Cant we just buy or collect all Pokmon cards? I just wanted to share this from my perspective so that it might be a bit easier to understand, as I get asked about it quite often
(or N as todays players would call it) had a way of drastically changing the course of a game