Horizon, Gravity Manipulator

At the beginning of your upkeep,
add 1 charge counter to Horizon
{3}{t} - Target creature gains or loses
flying, reach, high ground until end of turn
{6}{t} - Remove 7 charge counters from Horizon,
Create an artifact with,
"{4}{t} - Target players creatures that can attack
must attack this turn or their creatures
cannot attack this turn"