Cards you want to look out for are the slow lands, Sorin the Mirthless, Chandra, Dressed to Kill, Olivia, Crimson Bride, and control staple Hullbreaker Horror
You could get a higher power creature out faster or use an "enters" ability at a crucial time or bank some of that power into a Station
Any Elf attacking will always cause it to untap (assuming you didn't already untap it before) and can lead to a very threatening Elf board very quickly.
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