If you reduce your opponents Pokmons HP to zero, it is Knocked Out, then discarded (along with all attached cards) and you draw a Prize Card, which you add to your hand
Even when you cant quite make that happen, two mana to draw two and discard 1 isnt a bad deal, especially in a format with graveyard stuff all over the place This can Flash in and kill just about any X/1, which tends to feel pretty good
For example, if a character has taken 2 damage, you can place a die showing 2 on that card
And when you do manage to gang up and kill him, it's not like the Commander tax on a 3 mana leader is overly prohibitive to replaying Leo
All you have to do is sacrifice another creature to make a single Blood token
Realm of the Sea Emperor - 1st