Most card bannings are often the result of a mistake from Magics design team, and these cards are no exception
, : Put a training counter on target creature

Sort Card Type Karrablast #8Common $0.22 Karrablast #9Common $0.28 Karrablast #6Common $0.18 Karrablast #8Common $0.14 Karrablast #7Common $0.13 Karrablast #12Common $0.13 Karrablast #8Common $0.04 Karrablast #15Common $0.07 Karrablast #9Common $0.18 Karrablast #9Common $0.08 Karrablast #7Common $0.09 Karrablast #3Common Karrablast #1Common $0.10 Karrablast #3Common $3.00 Karrablast #8Common Karrablast - 009/086 #9Common $0.07 Karrablast - 009/086 (Master Ball Pattern) #9Common $2.87 Karrablast - 009/086 (Poke Ball Pattern) #9Common $0.36 Karrablast - 094/086 #94Illustration Rare $19.52 Karrablast - 094/086 #94Art Rare $8.50 Karrablast (Master Ball Pattern) #9Common $2.77 Karrablast (Poke Ball Pattern) #9Common $0.27 Karrablast - 094/086 #94Illustration Rare $19.52 Karrablast - 094/086 #94Art Rare $8.50 Karrablast #3Common $3.00 Karrablast - 009/086 (Master Ball Pattern) #9Common $2.87 Karrablast (Master Ball Pattern) #9Common $2.77 Karrablast - 009/086 (Poke Ball Pattern) #9Common $0.36 Karrablast #9Common $0.28 Karrablast (Poke Ball Pattern) #9Common $0.27 Karrablast #8Common $0.22 Karrablast #6Common $0.18

Lillie is able to make even the most simple of cards, such as this one, skyrocket in price thanks to her massive popularity
September 26, 2022 ST03-007 Sentomaru Note: This is an image of the fixed, post-errata version
This build was fairly casual, but I could definitely see an all-in Swords build with the best equipment in the game working really well