You have to meet certain criteria to run a companion, but this became effortless which warped various MTG formats such as Standard, Pioneer, and Modern until the mechanic changed in June 2020
It is a Darkness card illustrated by HYOGONOSUKE
GR Gold Rare Deep Sea Diva X WATER Level 2 [ Sea SerpentTunerEffect ] ATK 200 DEF 400 When this card is Normal Summoned: You can Special Summon 1 Level 3 or lower Sea Serpent monster from your Deck
Pokmon Black & White: Plasma Freeze (May 2013) Life Dew (107/116) Untethered from the need to use a specific Pokmon, Life Dew is a flexible and powerful card that can definitely mean the difference between winning and losing a game
EX3-007 U Digimon Lv.4 Lavorvomon Color Red Cost 4 DP 4000 Digivolve Cost 1 RedBlack 2 from Lv.3 Form Champion Attribute Virus Type Rock Dragon Card Text 1 [Effect] [On Play] Reveal the top 4 cards of your deck
The story that began in Weatherlight ran through the next four blocks and culminated in the final set of the Invasion block, Apocalypse