سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
It appears that in this context - as in the first paragraph of 10:21 or in 34:33 - both the noun makr (lit., "a scheme", or "scheming" or "plotting") and the verb yamkurun (lit., "they scheme" or "plot") have the connotation of "devising false [or "fallacious"] arguments" against something that is true. Since the preceding passages refer to God's creativeness and, in particular, to His power to create life and resurrect the dead (verse {9}), the "evil deeds" spoken of above are, presumably, specious arguments meant to "disprove" the announcement of resurrection.
It is the nature of Evil to work underground, to hide from the Light, to plot against Righteousness; but Evil inevitably carries its own punishment. Its plots must fail miserably. And eventually Evil itself is to be blotted out.
Good and Evil are to be distinguished sharply. No good is ever lost: it goes up to Allah. The humblest Good, in word or deed, is exalted to high rank. If man seeks for mere glory and power, there is no such thing apart from Allah. But seeking Allah, we attain to the highest glory and power.