[BUG] Deafening Silence and Crashing Footfalls
Crashing Footfalls and any effect that says you can only do one noncreature spell per turn if you play any other noncreature spell before Footfalls, even with correct mana to Suspend Footfalls, Arena will not let you Suspend the spell. If you Suspend Footfalls first it allows you to do another noncreature spell.
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Rezzahan#77802
commented
While suspend is a special action, it does require you to be able to cast the spell to do so. With your one noncreature spell per turn limit already reached, you cannot cast the spell, so you also cannot suspend the card.
116.2f A player who has a card with suspend in their hand may exile that card. This is a special
action. A player can take this action any time they have priority, but only if they could begin to
cast that card by putting it onto the stack. See rule 702.62, “Suspend.”702.62c While determining if you could begin to cast a card with suspend, take into consideration
any effects that would prohibit that card from being cast.