Because Yggdrasil has a triggered ability when it enters play, your opponents have a window to simply blow up Yggdrasil before you get any value, which would be quite unfortunate
Energy: 9x Grass Energy 8x Lightning Energy 6x Psychic Energy Pokemon: 2x Bulbasaur (LV 13) 1x Ivysaur (LV 20) 1x Venusaur (LV 67) 2x Nidoran - F (LV 13) 2x Nidoran - M (LV 20) 1x Nidorino (LV 25) 1x Tangela (LV 12) 2x Pikachu (LV 12) 1x Raichu (LV 40) 1x Magnemite (LV 13) 1x Electabuzz (LV 35) 2x Abra (LV 10) 1x Kadabra (LV 38) 2x Gastly (LV 8) 1x Haunter (LV 22) 1x Jynx (LV 23) 1x Jigglypuff (LV 14) 1x Meowth (LV 14) 1x Kangaskhan (LV 40) Trainer: 1x Professor Oak 1x Bill 1x Switch 1x Poke Ball 2x PlusPower 1x Defender 1x Gust of Wind 2x Potion 2x Full Heal --------------- Psychic Machamp --------------- Description: Machamp, Hitmonlee, Hitmonchan, Gengar, and Alakazam are furious
The Prismatic Evolutions Umbreon ex SIR is an extreme example, but even "common" secret rares from recent sets are worth checking
The Charizard ex SIR 199/165 from SV151 leads modern SIR pricing at approximately $234 in PSA 10 condition
There are also Snap Magikarp and Snap Gyarados cards, but Snap Pikachu is simply the more sought-after card, though