Aura and Equipment spells you cast cost less to cast, where X is Golden-Tail Trainer’s power.
Whenever Golden-Tail Trainer attacks, other modified creatures you control get +X/+X until end of turn, where X is Golden-Tail Trainer’s power. (Equipment, Auras you control, and counters are modifications.)
All costs to cast a spell are locked in before mana abilities are activated and those costs are paid. If Golden-Tail Trainer's power changes after costs are locked in, or if Golden-Tail Trainer leaves the battlefield while you are activating mana abilities or paying those costs, the cost reduction effect won't be affected and the total cost to cast the spell won't change.
07-06-2024
wotc
The value of X in Golden-Tail Trainer's last ability is determined only as the ability resolves.
07-06-2024
wotc
An Aura controlled by another player does not cause a creature you control to be modified.
07-06-2024
wotc
A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
07-06-2024
wotc
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
07-06-2024
wotc
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.
07-06-2024
wotc
Only creatures can be modified. If a modified creature stops being a creature, it is no longer considered modified.
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.