וּבְמֹפְתִים - זֶה הַדָּם, כְּמָה שֶּׁנֶּאֱמַר: וְנָתַתִּי מוֹפְתִים בַּשָּׁמַיִם וּבָאָרֶץ, דָּם וָאֵשׁ וְתִימְרוֹת עָשָׁן.

"And with wonders" - this [refers to] the blood, as it is stated (Joel 3:3); "And I will place my wonders in the skies and in the earth - blood, fire, and pillars of smoke."