Players can't discard cards
I don't think they every printed this next one. It might be a good idea:
Destroy target land. CARDNAME deals 3 damage to that land's controller.
Lifelink as a rule can apply to more than just creatures:
Enchanted permanent has lifelink (Whenever it deals damage, you gain that much life)
A fun build-around for Johnny:
Whenever a player sacrifices a creature, CARDNAME deals damage equal to that creature's power to target creature or player.
And finally, another little something that they haven't explored in design yet:
You get an emblem with "creatures you control have deathtouch"
That's it! Let me know what you guys think.