Gravity

Tiered (Choose a tier as you cast this spell by paying
the additional cost.)
• Gravity {b}: Put X -1/-1 counters on target creature, where X is half its toughness, rounded
down.
• Gravira {3}{b}{b}: Put X -1/-1 counters on up to
three target creatures, where X is their respective
toughness, rounded down.
• Graviga {5}{b}{b}{b}: Target player's life becomes
X/8, rounded up, where X is their life total.