yugioh invincible fortress deck Structure - Yu-Gi-Oh! the Invincible Fortress Structure Deck is a must Yugioh Deck Review: Structure Deck:

An effect that targets a monster on the field (or doesnt target it but is more restrictive), and makes it go boom

Any of these makes an excellent first box

Got the cavern doing front flips DOOD-JP033 Megalith Phuloch EARTH Rock/Ritual/Effect LV4 2000/300 You can Ritual Summon this card with any Megalith card

Have fun and go catch 'em all

It's demanding a fairly high price right now at $126.26 at TCGplayer, but if you really want this card, you can also just pick up its Super Rare variant for around $4 instead

Things you bought for fun because it was a personal interest of yours became accidental investments with massive profit potential