Buried Alive into Victimize is a classic, and if thats too slow, Ripples of Undeath is the business
These cards are mega-staples in the cEDH format, and both are fairly expensive to boot
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

Gallery and List of Godzilla MTG Cards Anguirus, Armored Killer (Gemrazer) Babygodzilla, Ruin Reborn (Pollywog Symbiote) Battra, Dark Destroyer (Dirge Bat) Bio-Quartz Spacegodzilla (Brokkos, Apex of Forever) Biollante, Plant Beast Form (Nethroi, Apex of Death) Destoroyah, Perfect Lifeform (Everquill Phoenix) Dorat, the Perfect Pet (Sprite Dragon) Ghidorah, King of the Cosmos (Illuna, Apex of Wishes) Gigan, Cyberclaw Terror (Gyruda, Doom of Depths) Godzilla Plains Godzilla Island Godzilla Swamp Godzilla Mountain Godzilla Forest Godzilla, Doom Inevitable (Yidaro, Wandering Monster) Godzilla, King of the Monsters (Zilortha, Strength Incarnate) Godzilla, Primeval Champion (Titanoth Rex) King Caesar, Ancient Guardian (Huntmaster Liger) King Caesar, Awoken Titan (Snapdax, Apex of the Hunt) Mechagodzilla, the Weapon (Crystalline Giant) Mothra, Supersonic Queen (Luminous Broodmoth) Mothras Great Cocoon (Mysterious Egg) Rodan, Titan of Winged Fury (Vadrok, Apex of Thunder) Spacegodzilla, Void Invader (Void Beckoner) What Formats Are They Legal In
