Chronomantic Escape

Chronomantic Escape can affect creatures that aren't on the battlefield at the time it resolves, because it modifies the announcement of an attack, not the creatures on the battlefield. For example, if Chronomantic Escape resolves on your turn, then on your opponent's turn they cast a creature with haste, that creature can't attack that turn.

Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.

Suspend is a keyword that represents three abilities. The first is a static ability that allows you to exile the card from your hand with the specified number of time counters (the number before the dash) on it by paying its suspend cost (listed after the dash). The second is a triggered ability that removes a time counter from the suspended card at the beginning of each of your upkeeps. The third is a triggered ability that gives you the option to cast the card when the last time counter is removed.