Every volume apparently included a promotional Japanese-language MTG card, many of them classic staples such as Shock, Worn Powerstone and Counterspell (MTG Arena Zone has published a full list, by volume)
Consider a similarly named Warden of the First Tree
Whenever Cutiefly evolves into Ribombee, an ability called Inviting Wink is activated
Barrensteppe Siege's Mardu ability will check as the end step starts to see if a creature died under your control this turn
That alone can swing a game, especially in lifegain decks or archetypes that protect high life totals
That might look like combo wins with cards like Thassa's Oracle and Urza, Lord High Artificer or good old-fashioned attackers, but some way to capitalize on the time you buy with interaction is critical