To cast Ugin’s Conjurant, first choose the value for X you’d like, then apply any cost increases, then any cost reductions. The number of counters it enters with may be different than the amount of mana you pay if an effect (such as that of Ugin, the Ineffable) causes that you pay an amount of mana other than {X}.

If Ugin’s Conjurant would be dealt more damage than it has counters, you remove all of the +1/+1 counters it has on it and prevent all of that damage. If another effect is raising its toughness, it will survive until the next time it’s dealt lethal damage.