Raggadragga, Goreguts Boss
Legendary Creature — Human Boar
Each creature you control with a mana ability gets +2/+2.
Whenever a creature you control with a mana ability attacks, untap it.
Whenever you cast a spell, if at least seven mana was spent to cast it, untap target creature. It gets +7/+7 and gains trample until end of turn.
Illustrated by
Commander Legends: Battle for Baldur's Gate#548RareEnglishLegality
Rulings
Raggadragga's last ability can target any creature, including one that's untapped.
Some creatures may have triggered mana abilities. A triggered mana ability is a triggered ability that could produce mana as it resolves, triggers on the resolution of an activated mana ability or on mana being added, and doesn't require a target.
Most mana abilities found on creatures are activated mana abilities. An activated mana ability is an activated ability that could produce mana as it resolves, does not require a target, and isn't a loyalty ability.