It is not necessary to pay the added2 extra cost for action abilities that are used from areas other than the Field, such as those from [11-015L] Braskas Final Aeon or [19-103H] Tidus etc
Alternatively, you can win with Twenty-Toed Toad which automatically wins the game if you have twenty or more cards in your hand or it has twenty or more counters on it
Most of these options are sorcery speed to boot
Ghalta Stampede Tyrant is a 12/12 with Trample for five colorless and three green mana
its possible to get around the lack of card draw a little by searching out a strong equipment to turn the tides, like Embercleave or Blackblade Reforged
FromTheShire: Hands down one of the best uncommon signpost cards, it's costed fairly, it flies, it poisons, and then it just keeps ever increasing pressure on your opponent