Slap on some normal moves and away it all goes
In that kind of race, youre unlikely to get enough Energy on your second Articuno ex to get another hit before that one, too, hits the discard pile.
We saw a lot of power, with double Student of Warfare / Time of Heroes nut draws and one-creature wins thanks to the fact that if we can fight through our opponent's removal and max level a creature, most of our level-up creatures can win the game by itself, but we also got Time Walked a lot of times and occasionally just played underpowered creatures (a good example of this was against Merfolk, where their creatures were often bigger and more powerful, even without the extra work of spending mana to level up)
Card draw, ramp and a win condition presented on one card make this an incredibly powerful card
(You may cast permanent cards from your graveyard by discarding a land card in addition to paying their other costs.) Legendary Creature - Treefolk Underworld Breach Each nonland card in your graveyard has escape