{1}: Look at the top three cards of your library, then put them back in any order.
{T}: Draw a card, then put Sensei's Divining Top on top of its owner's library.
If Sensei’s Divining Top leaves the battlefield while its second ability is on the stack, you’ll draw a card and leave Sensei’s Divining Top in the zone it’s moved to.
Sensei’s Divining Top’s second ability may be activated in response to its first ability. If so, you’ll draw a card, put Sensei’s Divining Top on top of your library, and then look at the top three cards and rearrange them.