Interdisciplinary Mascot

Ward is a triggered ability. Ward [cost] means “Whenever this permanent becomes the target of a spell or ability an opponent controls, counter that spell or ability unless that player pays [cost].”

Some ward abilities include an X in their cost and state what X is equal to. This value is determined at the time the ability resolves, not locked in as the ability triggers.

Convoke is a static ability that functions while the spell with convoke is on the stack. “Convoke” means “For each colored mana in this spell’s total cost, you may tap an untapped creature of that color you control rather than pay that mana. For each generic mana in this spell’s total cost, you may tap an untapped creature you control rather than pay that mana.”

The convoke ability isn’t an additional or alternative cost and applies only after the total cost of the spell with convoke is determined.

A creature tapped to pay for mana in a spell’s total cost this way is said to have “convoked” that spell.

Multiple instances of convoke on the same spell are redundant.