Spells your opponents cast that target Charix, the Raging Isle cost more to cast. : Charix gets +X/-X until end of turn, where X is the number of Islands you control.
Zendikar's seas are deeper than anyone can fathom.
An opponent's spell that targets Charix more than once costs only {2} more to cast.
25-09-2020
wotc
Each time you activate Charix's last ability, the value of X for that instance of the ability is determined only as that ability resolves. Once that happens, the size of the power-and-toughness change for that instance of the ability won't change later in the turn, even if the number of Islands you control does change.
25-09-2020
wotc
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases (such as that of Charix), then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.