They still cant be targeted and you cant block them, but you can attack with your creature, allow them to block, and then cast one of these spells to make the creature vulnerable in the middle of combat
Picture this, it's 2013, and you're settling in for a prerelease at your LGS, playing the second set from the Return to Ravnica expansion
When this doesnt happen (vs
With 180 HP and the powerful Rampaging Whirlpool attack, this card requires four Energy to unleash a devastating 140 damage while forcing the discard of a random Energy from all Pokemon on the board
When Link Summoned, it can target another Link Monster in the graveyard to gain its ATK
Potential energy is when an object has energy because of its position or condition