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Professor Hojo has a Training Grounds-style discount for targeted activated abilities, as well as other benefits for building around those sorts of effects

Or perhaps that common sets up an excellent combo for your deck

C Common Ogdoadic Serpent Strike X SPELL Continuous You can send 1 monster from your hand or field to the GY, then target 1 Reptile monster in your GY with a different original Attribute than that monster

He also basically gives an Instant flashback whenever an opponents Creature goes into their graveyard

Better Think Twice

Coronet #165 - Viridian Forest #166 - Heat Factory Prism Star #167 - Black Market Prism Star #168 - Life Forest Prism Star #169 - Wondrous Labyrinth #170 - Super Boost Energy Prism Star #171 - Triple Acceleration Energy #172 - Beast Energy Prism Star #173 - Recycle Energy #174 - Wishiwashi GX #175 - Dedenne GX #176 - Espeon & Deoxys GX #177 - Espeon & Deoxys GX #178 - Trevenant & Dusknoir GX #179 - Trevenant & Dusknoir GX #180 - Jirachi GX #181 - Darkrai & Umbreon GX #182 - Umbreon & Darkrai GX #183 - Weavile GX #184 - Melmetal GX #185 - Togepi & Cleffa & Igglybuff GX #186 - Togepi & Cleffa & Igglybuff GX #187 - Eevee GX #188 - Eevee GX #189 - Will #190 - Erika's Hospitality #191 - Misty & Lorelei #192 - Sightseer #193 - Blue's Tactics #194 - Bellelba & Brycen-Man #195 - Hapu #196 - Green's Exploration #197 - Roxie #198 - Mina #199 - Clay #200 - Welder #201 - Red's Challenge #202 - Grass Energy #203 - Fire Energy #204 - Water Energy #205 - Lightning Energy #206 - Psychic Energy #207 - Fighting Energy #208 - Darkness Energy #209 - Metal Energy #210 - Fairy Energy #211 - Wishiwashi GX #212 - Espeon & Deoxys GX #213 - Trevenant & Dusknoir GX #214 - Jirachi GX #215 - Umbreon & Darkrai GX #216 - Weavile GX #217 - Melmetal GX #218 - Togepi & Cleffa & Igglybuff GX #219 - Eevee GX #220 - Reshiram & Charizard GX #221 - Pikachu & Zekrom GX #222 - Mewtwo & Mew GX #223 - Greninja & Zoroark GX #224 - Lucario & Melmetal GX #225 - Garchomp & Giratina GX #226 - Moltres & Zapdos & Articuno GX Fire Energy Grass Energy Water Energy