Novijen, Heart of Progress

A manland's cousin: instead of becoming a creature, it grows the board, and only the creatures that just entered. The activated ability rewards a specific tempo of play, dumping multiple creatures in a single turn and then anointing all of them at once. This makes it a payoff for go-wide token decks and for any deck that can flash or flicker several bodies into a turn, since the counter lands on every creature that entered that turn, not just the ones you cast. The cost structure is the honest part: it taps for colorless on its own, so it always pays its way as a land, but the counter ability demands both green and blue plus the tap, which prices it as a slow, mana-intensive engine rather than a free upgrade. The Simic flavor is doing real design work here. The guild's whole identity is the marriage of growth (green's +1/+1 counters) and manipulation (blue's evasive, tempo-driven creatures), and this is that thesis compressed into a single land slot. The permanence matters too: unlike a one-shot anthem, each activation banks the bonus on the creatures forever, so a deck that activates it across several turns can stack a lasting size advantage out of an otherwise inert land drop.