Serrated Arrows enters with three arrowhead counters on it.

At the beginning of your upkeep, if there are no arrowhead counters on Serrated Arrows, sacrifice it.

, Remove an arrowhead counter from Serrated Arrows: Put a -1/-1 counter on target creature.

Bird creatures get +1/+1.

: Target Bird creature gains banding until end of turn. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding a player controls are blocking or being blocked by a creature, that player divides that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Remove Timmerian Fiends from your deck before playing if you're not playing for ante.

, Sacrifice Timmerian Fiends: The owner of target artifact may ante the top card of their library. If that player doesn't, exchange ownership of that artifact and Timmerian Fiends. Put the artifact card into your graveyard and Timmerian Fiends from anywhere into that player's graveyard. This change in ownership is permanent.

At the beginning of your upkeep, put a currency counter on Trade Caravan.

Remove two currency counters from Trade Caravan: Untap target basic land. Activate only during an opponent's upkeep.

: Veldrane of Sengir gets -3/-0 and gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)

Flying

Flip a coin. If you win the flip, Winter Sky deals 1 damage to each creature and each player. If you lose the flip, each player draws a card.