Im ready to be wrong here, but with the increased power of two and three drop creatures, five mana removal is worse than it used to be
[All Turns] When any of your level 5 or higher [TB] trait Digimon would leave the battle area, Delay
Creature - Human Soldier Color tag templates(None) Gryff Rider Flying Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.) Creature - Human Knight Color tag templates(None) Hamlet Vanguard Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .) This creature enters with two +1/+1 counters on it for each other nontoken Human you control
Before 2017, the only card that incentivized a Cat deck was Raksha Golden Cub and Kemba, Kha Regent if you squint
That suggests that at least for now, the plan is for trading to only be available for older sets, presumably the ones where hardcore players have already maxed out most of their library and are just chasing a final handful of cards that still havent come up in packs for them
If life was paid, this planeswalker enters with two fewer loyalty counters.) +1: Until your next turn, up to one target creature gets -3/-0.2: Target player mills three cards