forgotten realms collector booster box Adventures in the Box, Adventures each of which contain 15 Magic Adventire in the forgotten realm

I guess mill support like Foolish Burial and the Ishizu EARTH/Fairies can get Slifer in the GY easily, but then it's a matter of drawing this and then waiting for a direct attack, and even then, nowadays most modern decks have ways to deal with 3000+ ATK beaters without any sort of protection, although admittedly I do have seen duels where decks do not have outs to such cards or have already spent their resources.

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Two other ramp spells I had considered running were Explosive Vegetation and Tempt with Discovery

A more aggressive build with Vial Smasher the Fierce or a blink build with Thrasios, Triton Hero will be able to take advantage of Yoshimaru's ability the best