I think about adding
Built to Smash for
Highspire Infusion. Is this a good idea? Because
Built to Smash gives to
Electrostatic Pummeler trample (it's still an artifact creature) and +3/+3 like
Highspire Infusion and with lesser CMC, but
Highspire Infusion allows you (with one more energy for example from
Aether Hub) to activate Pummeler's ability for three times instead of one. It is bad, that if you don't have
Larger Than Life and
Fling in hand, it must attack and don't have trample. But I think that's low chance. Mayby add
Built to Smash instead of
Longtusk Cub, 3 times is I think too much.
But now I add
Built to Smash to sideboard, because it's for attacking creature, and it can be targeted by for example
Immolating Glare, so I want to sacrifise it to
Fling rather than attack, if possible. It is true, that I can in reaction for
Immolating Glare or other destroyers sacrifise it to
Fling, but it's still a little bit tricky.