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As Indominus Rex enters, discard any number of creature cards. It enters with a flying counter on it if a card discarded this way has flying. The same is true for first strike, double strike, deathtouch, hexproof, haste, indestructible, lifelink, menace, reach, trample, and vigilance.
When Indominus Rex enters, draw a card for each counter on it.
If Indominus Rex isn't on the battlefield as its last ability resolves, use the number of counters that were on it when it was last on the battlefield to determine how many cards to draw.
If you put counters on Indominus Rex before its last ability resolves, those counters will count.
Indominus Rex's first ability will give it only one of each kind of counter, even if you discard more than one creature card with the relevant ability.
