On a well-supported type like vampire, convoke feels like a cost reduction since good vampires can come down before this and gladly for it
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The option to pay a spell differently is usually stated in the text of the spell (or ability suggesting an alternative payment) and appears as follows: You may [perform an action] rather than pay [this object]s mana cost This is stated on Force of Will or Shining Shoal, as well as in the rules for Flashback, Overload and Evoke
Illustrated by Volta Creation Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Turn it face up any time for its mana cost if it's a creature card.) Instant Protection (CTRL to add secondary) Pump Deathmist Raptor Deathtouch Whenever a permanent you control is turned face up, you may return this card from your graveyard to the battlefield face up or face down
This may be what you want to do, but thats pretty unlikely