Their power varies wildly based on strategy and format, so lets get out the jewelers loupe and take a look at these crystals
Once a replacement effect has been applied to an event, it can't be applied again to the resulting events
(d) At the beginning of your end step, if this permanent was cast for its impending cost, remove a time counter from it
In this sense, the mechanic is very similar to kicker as the spell gets stronger when you pay more mana
Mega Battle Deck - Mega Gengar ex Decklist Mega Battle Deck Pokmon (17) 2 Mega Gengar ex PFL 056 1 Haunter PFL 055 1 Haunter MEP 027 4 Gastly PFL 054 2 Toxtricity PFL 067 2 Toxel PFL 068 2 Sableye PFL 059 2 Seviper PFL 062 1 Eternatus PFL 069 Trainers (30) 2 Risky Ruins 4 Lillie's Determination 2 Arven 2 Boss's Orders (Ghetsis) 1 Dawn PFL 087 1 Grimsley's Move PFL 090 1 Iono 3 Nest Ball 2 Buddy-Buddy Poffin 2 Night Stretcher 2 Rare Candy 1 Switch 2 Ultra Ball 1 Pokgear 3.0 1 Mega Signal 2 Punk Helmet PFL 092 Energies (13) 13 Basic Darkness Energy Note that it has a lot of basic energies
It destroys a creature and replaces it with a 3/3 Ape token, all for one mana to make it easy to cast at any point
