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When you have a Kronch Wrangler on the battlefield
Whenever a creature with power 4 or greater enters the battlefield under your control, put a +1/+1 counter on Kronch Wrangler.
and a Bloom Hulk enters the battlefield
When Bloom Hulk enters the battlefield, proliferate.
which ETB effect goes onto the stack first?
Are the triggers simultaneous, so I as an active player can choose to give my Kronch Wrangler a counter, and then proliferate it?