You can spend countless hours improving your knowledge, even as a veteran planeswalker looking up cards, reading about combos, pondering the possibilities of your deck
In addition, there was no thoughtful moment of game play
If you can't tell, sacrificing any kind of mana card permanently is extremely bad in this game, let alone one that gives you a minimal boost
Battle at the Bridge is one such card from the recent Aether Revolt set where the insidious Tezzeret hints at the portent of things still to come in Magics future
* If the visible rare or known Planeswalker is great ** While not released, the 'Collector's Booster' is known to contain 3 Rares/Mythics and is more likely to be in this tier
If those creatures have total power 8 or greater, convert Ultra Magnus