Unfortunately, giving Keranos deathtouch will be quite difficult
There are only really a handful of exile board wipes, and many of them are quite expensive so you either go drastic to get rid of Avacyn, or she stays until the game is finished
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and because Limited play is almost always won on the back of creature combat, finding the opportunities to trade one creature, removal spell, or well-placed buff for more than one creature will pay off dividends
One of the biggest problems with five-color commanders is that they often don't fit the theme of the deck, but Ramos, Dragon Engine breaks this mode by actually making the fact that you're playing five colors matter
You'll notice my graveyard takes up a majority of my side of the battlefield (outlined in red), my creatures and lands are somewhat squished in the center, and my exile pile is all the way on the opponent side (outlined in yellow)