Where do I put the Supporter card revealed with Random Receiver?
Read the Random Receiver card and you'll see it goes from the revealed cards into your hand before you shuffle. You do not put the card aside face up on the field nor shuffle before putting it into your hand. This applies to other cards that use the "reveal... put it in your hand... shuffle" template like Ultra Ball, etc.
Source: TPCi Rules Team (2013-08-15)

Relevant cards

Note: All applicable cards may not be listed below.
BW5_99
BW8_138
XY10_109