The net result is that threats like Hazoret, Kalitas, [Card]Glorybringer[/Card], and just three-drops with high toughness in general, are surprisingly difficult to bring down and can easily take over the game against an opponent who showed too much respect for [Card]Bomat Courier[/Card]
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Attacks alone in this case means that it is the only creature declared as an attacker if other creatures or token are then created and enter the battlefield attacking, Exalted still goes off, as they werent declared attackers
Control the board with counters (Absorb, Negate, Thought Collapse, Didnt Say Please) and sweepers (Fumigate, Time Wipe)
Some artifact payoffs, like Urza, Lord High Artificer and cards with affinity, might not care if the Opal taps for mana or not
It doesnt have to be combat damage, and it doesnt have to be a creature