If you haven't gained 3 or more life by the time an end step begins, Gwaihir, Greatest of the Eagles's ability won't trigger at all
However, one Ace Spec provides a massive damage buff without any drawbacks, as Maximum Belt is incredibly useful in a variety of decks
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Now, you can tap useless things like Landers, spacecraft, or whatever else
Gitaxian Probe is the other interesting one here since it costs a blue Phyrexian mana (meaning you can pay two life instead of a blue mana), letting you peek at a players hand and draw a single card
