You only have to pay energy after they block, and unless they have tokens to feed you, theres some inherent risk in blocking
For collectors, the price of rare serialized cards has already climbed on sites and stores, showing their long-term value
Taeko, the Patient Avalanche This four-mana mono-Blue 4/5 Turtle Ninja ETBs tapped, and then when another dork you control leaves without dying, you can scry 1 and toss a +1/+1 counter here
The best ones are once again going to be removal spells like Overkill, Cloud of Darkness, and Lightning Bolt
low CMC mana ramp spells like Natures Lore and/or mana rocks like Arcane Signet and Sol Ring will take care of the latter
This offers an additional layer of complexity when facing down a Chandra, Dressed to Kill