Its most common use is to copy a simple, cheap spell, like a 1-mana cantrip or a light removal spell

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Theyre not removed if the creature regenerates or the turn ends
It was clear and obvious in the context of each individual game why Jace was so powerful but it was less clear to me why this was a general case
one art card matching the tin, featuring Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon or Sylveon
A general rule of thumb is to expect your deck to be from 20% to 50% thicker