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At the beginning of your end step, target opponent gains control of up to one target creature you control. Put two +1/+1 counters on it and tap it. It's goaded for the rest of the game and it gains "This creature can't be sacrificed." (It attacks each combat if able and attacks a player other than you if able.)
Whenever a creature you own but don't control attacks, you draw a card.
A token's owner is the player who created it.
When Jon Irenicus's first ability resolves, the opponent will gain control of a creature and that creature will immediately gain “This creature can't be sacrificed” as part of the resolution of the ability. There is no window of opportunity for that player to sacrifice that creature before it gains the ability.
