If youve attacked with an Xyz monster during your turn, during your Main Phase 2, you can Xyz summon this monster by using any other Xyz monster as material
"These incredible Pokmon have crossed borders and language barriers to reach the hearts of millions for over 27 years, bringing people together through the joy of play and discovery." The birth of Pokmon The first games, "Pokmon Red and Green," were released in Japan on February 27, 1996, for the Game Boy

Sort Card Type Dark Ivysaur - 6 #6Promo $44.67 Dark Ivysaur - 6 [Winner] #6Promo $100.36 Erika's Ivysaur #41Uncommon $13.46 Ivysaur #30Uncommon $5.97 Ivysaur #30Uncommon $17.10 Ivysaur #44Uncommon $8.09 Ivysaur #5Promo $61.23 Ivysaur #47Uncommon $4.81 Ivysaur #82Uncommon $18.34 Ivysaur #35Uncommon $2.76 Ivysaur #7Uncommon $43.14 Ivysaur #14Common $12.39 Ivysaur #51Uncommon $1.78 Ivysaur #62Uncommon $4.21 Ivysaur #2Uncommon $9.75 Ivysaur #2Common $0.39 Ivysaur #2Uncommon $0.20 Ivysaur #2Classic Collection $6.85 Ivysaur #2Uncommon $0.42 Ivysaur #2None $0.88 Ivysaur #2Common $4.16 Ivysaur - 002/063 #2Common $0.18 Ivysaur - 002/132 #2Common $0.25 Ivysaur - 002/165 #2Uncommon $0.29 Ivysaur - 002/165 #2Uncommon $0.18 Ivysaur - 002/165 (Master Ball Pattern) #2Uncommon $12.55 Ivysaur - 002/165 (Poke Ball Pattern) #2Uncommon $1.61 Ivysaur - 034/100 #34Uncommon $17.59 Ivysaur - 035/100 #35Uncommon $3.95 Ivysaur - 065/063 #65Art Rare $6.92 Ivysaur - 134/132 #134Illustration Rare $21.58 Ivysaur - 167/165 #167Illustration Rare $44.53 Ivysaur - 167/165 #167Art Rare $14.79 Ivysaur - 35/100 (Prerelease) #35Promo $54.98 Ivysaur (Mirror Holofoil) #2None $5.32 Dark Ivysaur - 6 [Winner] #6Promo $100.36 Ivysaur #5Promo $61.23 Ivysaur - 35/100 (Prerelease) #35Promo $54.98 Dark Ivysaur - 6 #6Promo $44.67 Ivysaur - 167/165 #167Illustration Rare $44.53 Ivysaur #7Uncommon $43.14 Ivysaur - 134/132 #134Illustration Rare $21.58 Ivysaur #82Uncommon $18.34 Ivysaur - 034/100 #34Uncommon $17.59 Ivysaur #30Uncommon $17.10

That technically makes it a steal at three mana , trampling over an opponent every turn as an indestructible monster
Now, my problem with [casthaven]Furance of Rath[/casthaven] effects is that I really only ever see them seeing play in one of two different style decks: either hyper-aggro/commander damage decks that use them as overruns, or in damage combo decks that use these doublers with cards like [casthaven]Stuffy Doll[/casthaven], [casthaven]Mogg Maniac[/casthaven], or [casthaven]Repercussion[/casthaven] to quadruple spells like [casthaven]Blasphemous Act[/casthaven] for a fairly instant combo kill
#43 Oddish