all WATER monsters you currently control gain 500 ATK/DEF
Reconstruct History is just one enabler available to help it work
This gives you all sorts of versatility with your lands, where instead of just waiting until you need them to tap mana, you can tap lands you don't need or might not need to commit mana to and use them to make a bunch of Treasure tokens
The Power Nine (Black Lotus, Mox Emerald, Mox Jet, Mox Pearl, Mox Ruby, Mox Sapphire, Timetwister, Time Walk, and Ancestral Recall) are all on there, as are other notable cards like Divine Intervention, Time Spiral, the ten Dual Lands, and Fastbond
Sometimes, youll find higher HP or attack values than you may expect on a card
Bringing back several big creatures that were destroyed or milled can be a game-winning move if the player waits for the right moment to cast this