Helix of the Wild

Helix of the Wild enters the battlefield tapped.
Whenever a player casts a spell, put a charge counter on Helix of the Wild.
{5}, {t}, Sacrifice Helix of the Wild: During your next combat phase, creatures you control gain trample and get +X/+X, where X is the number
of charge counters on Helix of the Wild.
Only one helix can cause such strength.