For actual Toon decks, it is still the cleanest way to reach whatever piece the hand is missing, whether that is the Field Spell, protection, a monster, or another search route into the next play
[C][C][C] Everybody Rollout: 20x damage
Since colorless mana is generally going to be easy to generate a fair amount of, you could get this hitting as early as turn 4 quite likely and then use it to develop a game plan
Its elegant design and strong synergy with modern decks increase its appeal
If you can consistently put out a number of permanents, it's a solid attacker
Origin of Metalbending Toph makes metal really flexible and Origin of Metalbending puts a +1/+1 counter on your board, because you know green decks love those counters