The four mana is a lot but having flash goes a really long way to solving this, it makes him playable in control and slower decks and makes it far easier to get lots of value from
Spirit-Sister's Call allows you to sacrifice a permanent at the beginning of your end step to replace it with a permanent that shares a type with it: creature, Planeswalker, land, enchantment, or artifact
Which one will win this Championship
This system makes collecting less enjoyable than rewarding for those who've spent time and money on finishing previous expansions
Perhaps you tip Denry off to an indestructible counter located in Tyrite Sanctum, or maybe you give it a double strike counter from Avenging Huntbonder
No, Mega Evolution cards are not good for beginners, as they involve higher-risk gameplay mechanics and are no longer part of the Standard format, making them better suited for collectors or experienced players.